2024年、現在の環境に適したリセットCSSのまとめ

Post on:2024年4月17日

リセットCSSとは

リセットCSSとは、ブラウザに付属しているデフォルトのスタイルを打ち消す（リセットする）CSSのことです。

すべてのブラウザには、表示するWebページのすべてに適用される「user agent stylesheet（以下、UA stylesheet）」と呼ばれるデフォルトのスタイルが付属しています。これらのスタイルシートはオープンソースで公開されています。

下記ページに各ブラウザのuser agent stylesheetをまとめました。

user agent stylesheetのまとめ -Chrome, Safari, Firefox, Edge 各ブラウザごとのデフォルトのスタイルシート

最近では多くのスタイルがすべてのUA stylesheetで一貫されていますが、一貫されていないものもあります。UA stylesheetごとの矛盾を扱うために、CSSリセットは誕生しました。CSSリセットとはブラウザによるスタイルの差異をなくすことが目的で、通常はスタイルの一番上に記述し、他のスタイルの前にページに適用されるスタイルです。

また、似たものとしてノーマライズがあります。リセットではすべてのスタイルに同じビジュアルを与えますが、ノーマライズでは多くの有用なUA stylesheetのスタイルを維持するものです。

CSSリセットとは異なる、Normalize.cssの特徴や使い方などの解説

リセットCSSの使い方・書く順番

リセットCSSの使い方は、通常のCSSと同じです。
ただし、ブラウザに付属しているデフォルトのスタイルを打ち消すために使用するので、リセットCSSを一番上に記述します。

リセットCSSがreset.css、通常のCSSがstyle.cssの場合、下記の順番で記述します。

<head>
  <link rel="stylesheet" href="reset.css">
  <link rel="stylesheet" href="style.css">
</head>

<head>

</head>

HTMLに記述する時の注意点は、下記ページに詳しく解説しています。

最近の実装に合わせたHTMLテンプレート、基本のコードとすべての要素の役割も解説

どのリセットCSSが適しているかの選び方・カスタマイズ方法

この記事ではたくさんのリセットCSSを紹介していますが、実際に使用する際には1つで十分です。ではどのリセットCSSが自分に適しているか、下記の項目を目安にします。

IEをサポートする（比較的古いもの）。
※マイクロソフトはIE11のサポートを2022年6月15日に終了しました。
ユーザエージェントによるスタイルのエラーを修正（ノーマライズ系）。
ユーザエージェントによる独自スタイルを元に戻す（リセット系）。
一貫したスタイルのベースを作成する（独自のスタイルを作成）。

選び方やカスタマイズの詳しい方法は下記をご覧ください。

A (more) Modern CSS Reset -モダンブラウザに最適化された新しいリセットCSS

後述のモダンブラウザ用のリセットCSS「A Modern CSS Reset」から、現在の環境に合わせてモダンブラウザに最適化されたリセットCSSです。

モダンブラウザをターゲットにしたWeb制作では、リセットCSS自体が必要ないかもしれません。とは言っても、設定しておきたいスタイルや一部のブラウザ用に設定しておきたいスタイルがあり、それらをまとめたものです。

*,*::before,*::after{box-sizing:border-box}html{-moz-text-size-adjust:none;-webkit-text-size-adjust:none;text-size-adjust:none}body,h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}ul[role='list'],ol[role='list']{list-style:none}body{min-height:100vh;line-height:1.5}h1,h2,h3,h4,button,input,label{line-height:1.1}h1,h2,h3,h4{text-wrap:balance}a:not([class]){text-decoration-skip-ink:auto;color:currentColor}img,picture{max-width:100%;display:block}input,button,textarea,select{font:inherit}textarea:not([rows]){min-height:10em}:target{scroll-margin-block:5ex}

*,*::before,*::after{box-sizing:border-box}html{-moz-text-size-adjust:none;-webkit-text-size-adjust:none;text-size-adjust:none}body,h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}ul[role='list'],ol[role='list']{list-style:none}body{min-height:100vh;line-height:1.5}h1,h2,h3,h4,button,input,label{line-height:1.1}h1,h2,h3,h4{text-wrap:balance}a:not([class]){text-decoration-skip-ink:auto;color:currentColor}img,picture{max-width:100%;display:block}input,button,textarea,select{font:inherit}textarea:not([rows]){min-height:10em}:target{scroll-margin-block:5ex}

※2023/9/18(A (more) Modern CSS Reset)

上記のスタイルシートは、コメントなどを削除したものです。
各スタイルシートの詳しい説明は、以前の記事をご覧ください。

古いリセットCSSからはもう卒業！モダンブラウザに最適化された新しいリセットCSS

@acab/reset.css -CSSの新機能を効果的にうまく使った、新時代のリセットCSS

:whereで詳細度を低く保ち、iOSのSafariで100vhが高さいっぱいにならないを解決できる新しいビューポート単位、color-schemeによる自動ダークモードなど、CSSの新機能を効果的に使用した新時代のリセットCSS。

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}:where([hidden]:not([hidden='until-found'])){display:none!important}:where(html){-webkit-text-size-adjust:none;color-scheme:dark light;tab-size:2;scrollbar-gutter:stable}:where(html:has(dialog:modal[open])){overflow:clip}@media (prefers-reduced-motion:no-preference){:where(html:focus-within){scroll-behavior:smooth}}:where(body){line-height:1.5;font-family:system-ui,sans-serif;-webkit-font-smoothing:antialiased}:where(button){all:unset}:where(input,button,textarea,select){font:inherit;color:inherit}:where(textarea){resize:vertical;resize:block}:where(button,label,select,summary,[role='button'],[role='option']){cursor:pointer}:where(:disabled){cursor:not-allowed}:where(label:has(>input:disabled),label:has(+input:disabled)){cursor:not-allowed}:where(a){color:inherit;text-underline-offset:.2ex}:where(ul,ol){list-style:none}:where(img,svg,video,canvas,audio,iframe,embed,object){display:block}:where(img,picture,svg,video){max-inline-size:100%;block-size:auto}:where(p,h1,h2,h3,h4,h5,h6){overflow-wrap:break-word}:where(h1,h2,h3){line-height:calc(1em + 0.5rem);text-wrap:balance}:where(hr){border:none;border-block-start:1px solid;color:inherit;block-size:0;overflow:visible}:where(dialog){border:none;background:none;inset:unset;max-width:unset;max-height:unset}:where(dialog:not([open])){display:none!important}:where(:focus-visible){outline:3px solid CanvasText;box-shadow:0 0 0 5px Canvas;outline-offset:1px}:where(:focus-visible,:target){scroll-margin-block:8vh}:where(.visually-hidden:not(:focus-within,:active)){clip-path:inset(50%)!important;height:1px!important;width:1px!important;overflow:hidden!important;position:absolute!important;white-space:nowrap!important;border:0!important}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}:where([hidden]:not([hidden='until-found'])){display:none!important}:where(html){-webkit-text-size-adjust:none;color-scheme:dark light;tab-size:2;scrollbar-gutter:stable}:where(html:has(dialog:modal[open])){overflow:clip}@media (prefers-reduced-motion:no-preference){:where(html:focus-within){scroll-behavior:smooth}}:where(body){line-height:1.5;font-family:system-ui,sans-serif;-webkit-font-smoothing:antialiased}:where(button){all:unset}:where(input,button,textarea,select){font:inherit;color:inherit}:where(textarea){resize:vertical;resize:block}:where(button,label,select,summary,[role='button'],[role='option']){cursor:pointer}:where(:disabled){cursor:not-allowed}:where(label:has(>input:disabled),label:has(+input:disabled)){cursor:not-allowed}:where(a){color:inherit;text-underline-offset:.2ex}:where(ul,ol){list-style:none}:where(img,svg,video,canvas,audio,iframe,embed,object){display:block}:where(img,picture,svg,video){max-inline-size:100%;block-size:auto}:where(p,h1,h2,h3,h4,h5,h6){overflow-wrap:break-word}:where(h1,h2,h3){line-height:calc(1em + 0.5rem);text-wrap:balance}:where(hr){border:none;border-block-start:1px solid;color:inherit;block-size:0;overflow:visible}:where(dialog){border:none;background:none;inset:unset;max-width:unset;max-height:unset}:where(dialog:not([open])){display:none!important}:where(:focus-visible){outline:3px solid CanvasText;box-shadow:0 0 0 5px Canvas;outline-offset:1px}:where(:focus-visible,:target){scroll-margin-block:8vh}:where(.visually-hidden:not(:focus-within,:active)){clip-path:inset(50%)!important;height:1px!important;width:1px!important;overflow:hidden!important;position:absolute!important;white-space:nowrap!important;border:0!important}

※2024/4/12（GitHub）

上記のスタイルシートは、コメントなどを削除したものです。
各スタイルシートの詳しい説明は、以前の記事をご覧ください。

CSSの新機能を効果的にうまく使った、新時代のCSSリセット -acab/reset.css

Josh's Custom CSS Reset -最近の仕様に対応したCSSリセット

過去のリセットCSSは10年以上も更新されておらず、その間にCSSは進化しました。最近のデバイス・モダンブラウザの仕様に対応したモダンリセットCSSです。このリセットCSSはデザインに関係なく、どんなプロジェクトでも使用できます。

/*
  Josh's Custom CSS Reset
  https://www.joshwcomeau.com/css/custom-css-reset/
*/
*,*::before,*::after{box-sizing:border-box}*{margin:0}body{line-height:1.5;-webkit-font-smoothing:antialiased}img,picture,video,canvas,svg{display:block;max-width:100%}input,button,textarea,select{font:inherit}p,h1,h2,h3,h4,h5,h6{overflow-wrap:break-word}#root,#__next{isolation:isolate}

Josh's Custom CSS Reset

https://www.joshwcomeau.com/css/custom-css-reset/

*,*::before,*::after{box-sizing:border-box}*{margin:0}body{line-height:1.5;-webkit-font-smoothing:antialiased}img,picture,video,canvas,svg{display:block;max-width:100%}input,button,textarea,select{font:inherit}p,h1,h2,h3,h4,h5,h6{overflow-wrap:break-word}#root,#__next{isolation:isolate}

※2023/6/9 （Josh's Custom CSS Reset）

上記のスタイルシートは、コメントなどを削除したものです。
各スタイルシートの詳しい説明は、以前の記事をご覧ください。

モダンCSSリセットを徹底解説、最近のデバイス・モダンブラウザの仕様に対応

このJosh's Custom CSS ResetにインスパイアされたリセットCSSもあります。

/*
  Made by Elly Loel - https://ellyloel.com/
*/
*{margin:0;padding:0;line-height:calc(0.25rem+1em+0.25rem)}*,::before,::after{box-sizing:border-box}*:where(:not(fieldset,progress,meter)){border-width:0;border-style:solid;background-origin:border-box;background-repeat:no-repeat}
html{block-size:100%;-webkit-text-size-adjust:none}
@media(prefers-reduced-motion:no-preference){html:focus-within{scroll-behavior:smooth}}
body{text-rendering:optimizeSpeed;min-block-size:100%}:where(img,svg,video,canvas,audio,iframe,embed,object){display:block}:where(img,svg,video){block-size:auto;max-inline-size:100%}:where(svg){stroke:none;fill:currentColor}:where(svg):where(:not([fill])){stroke:currentColor;fill:none;stroke-linecap:round;stroke-linejoin:round}:where(svg):where(:not([width])){inline-size:5rem}:where(input,button,textarea,select),:where(input[type="file"])::-webkit-file-upload-button{color:inherit;font:inherit;font-size:inherit;letter-spacing:inherit;word-spacing:inherit}:where(textarea){resize:vertical}
@supports(resize:block){:where(textarea){resize:block}}:where(p,h1,h2,h3,h4,h5,h6){overflow-wrap:break-word}
h1{font-size:2em}:where(ul,ol){list-style-position:inside}:where(ul,ol)[role="list"]{list-style:none}
a:not([class]){text-decoration-skip-ink:auto}:where(a[href],area,button,input,label[for],select,summary,textarea,[tabindex]:not([tabindex*="-"])){cursor:pointer;touch-action:manipulation}:where(input[type="file"]){cursor:auto}:where(input[type="file"])::-webkit-file-upload-button,:where(input[type="file"])::file-selector-button{cursor:pointer}
@media(prefers-reduced-motion:no-preference){:focus-visible{transition:outline-offset 145ms cubic-bezier(0.25,0,0.4,1)}:where(:not(:active)):focus-visible{transition-duration:0.25s}}:where(:not(:active)):focus-visible{outline-offset:5px}:where(button,button[type],input[type="button"],input[type="submit"],input[type="reset"]),:where(input[type="file"])::-webkit-file-upload-button,:where(input[type="file"])::file-selector-button{-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;user-select:none;text-align:center}:where(button,button[type],input[type="button"],input[type="submit"],input[type="reset"])[disabled]{cursor:not-allowed}

Made by Elly Loel - https://ellyloel.com/

*{margin:0;padding:0;line-height:calc(0.25rem+1em+0.25rem)}*,::before,::after{box-sizing:border-box}*:where(:not(fieldset,progress,meter)){border-width:0;border-style:solid;background-origin:border-box;background-repeat:no-repeat}

html{block-size:100%;-webkit-text-size-adjust:none}

@media(prefers-reduced-motion:no-preference){html:focus-within{scroll-behavior:smooth}}

body{text-rendering:optimizeSpeed;min-block-size:100%}:where(img,svg,video,canvas,audio,iframe,embed,object){display:block}:where(img,svg,video){block-size:auto;max-inline-size:100%}:where(svg){stroke:none;fill:currentColor}:where(svg):where(:not([fill])){stroke:currentColor;fill:none;stroke-linecap:round;stroke-linejoin:round}:where(svg):where(:not([width])){inline-size:5rem}:where(input,button,textarea,select),:where(input[type="file"])::-webkit-file-upload-button{color:inherit;font:inherit;font-size:inherit;letter-spacing:inherit;word-spacing:inherit}:where(textarea){resize:vertical}

@supports(resize:block){:where(textarea){resize:block}}:where(p,h1,h2,h3,h4,h5,h6){overflow-wrap:break-word}

h1{font-size:2em}:where(ul,ol){list-style-position:inside}:where(ul,ol)[role="list"]{list-style:none}

a:not([class]){text-decoration-skip-ink:auto}:where(a[href],area,button,input,label[for],select,summary,textarea,[tabindex]:not([tabindex*="-"])){cursor:pointer;touch-action:manipulation}:where(input[type="file"]){cursor:auto}:where(input[type="file"])::-webkit-file-upload-button,:where(input[type="file"])::file-selector-button{cursor:pointer}

@media(prefers-reduced-motion:no-preference){:focus-visible{transition:outline-offset 145ms cubic-bezier(0.25,0,0.4,1)}:where(:not(:active)):focus-visible{transition-duration:0.25s}}:where(:not(:active)):focus-visible{outline-offset:5px}:where(button,button[type],input[type="button"],input[type="submit"],input[type="reset"]),:where(input[type="file"])::-webkit-file-upload-button,:where(input[type="file"])::file-selector-button{-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;user-select:none;text-align:center}:where(button,button[type],input[type="button"],input[type="submit"],input[type="reset"])[disabled]{cursor:not-allowed}

※2024/4/14 （GitHub）

最近のデバイス・ブラウザの仕様に適した新しいCSSリセット -EllyLoel/reset.css

The New CSS Reset -すべてのスタイルを削除するリセットCSS

CSSの新しい機能を使用した、シンプルで軽量なCSSのリセット。
displayプロパティを除いて、ブラウザから取得されるデフォルトのスタイルを使用したくないという目的に基づいて構築されています。

/*** The new CSS reset - version 1.11.1 (last updated 24.10.2023) ***/

*:where(:not(html,iframe,canvas,img,svg,video,audio):not(svg*,symbol*)){all:unset;display:revert}*,*::before,*::after{box-sizing:border-box}
html{-moz-text-size-adjust:none;-webkit-text-size-adjust:none;text-size-adjust:none}
a,button{cursor:revert}
ol,ul,menu,summary{list-style:none}
img{max-inline-size:100%;max-block-size:100%}
table{border-collapse:collapse}
input,textarea{-webkit-user-select:auto}
textarea{white-space:revert}
meter{-webkit-appearance:revert;appearance:revert}:where(pre){all:revert;box-sizing:border-box}::placeholder{color:unset}:where([hidden]){display:none}:where([contenteditable]:not([contenteditable="false"])){-moz-user-modify:read-write;-webkit-user-modify:read-write;overflow-wrap:break-word;-webkit-line-break:after-white-space;-webkit-user-select:auto}:where([draggable="true"]){-webkit-user-drag:element}:where(dialog:modal){all:revert;box-sizing:border-box}

/*** The new CSS reset - version 1.11.1 (last updated 24.10.2023) ***/

*:where(:not(html,iframe,canvas,img,svg,video,audio):not(svg*,symbol*)){all:unset;display:revert}*,*::before,*::after{box-sizing:border-box}

html{-moz-text-size-adjust:none;-webkit-text-size-adjust:none;text-size-adjust:none}

a,button{cursor:revert}

ol,ul,menu,summary{list-style:none}

img{max-inline-size:100%;max-block-size:100%}

table{border-collapse:collapse}

input,textarea{-webkit-user-select:auto}

textarea{white-space:revert}

meter{-webkit-appearance:revert;appearance:revert}:where(pre){all:revert;box-sizing:border-box}::placeholder{color:unset}:where([hidden]){display:none}:where([contenteditable]:not([contenteditable="false"])){-moz-user-modify:read-write;-webkit-user-modify:read-write;overflow-wrap:break-word;-webkit-line-break:after-white-space;-webkit-user-select:auto}:where([draggable="true"]){-webkit-user-drag:element}:where(dialog:modal){all:revert;box-sizing:border-box}

※2023/10/24 ver.1.11.1（GitHub）

上記のスタイルシートは、コメントなどを削除したものです。
各スタイルシートの詳しい説明は、以前の記事をご覧ください。

新しいCSSリセットはシンプルで軽量！CSSの新しい機能を使用したCSSリセット -The New CSS Reset

A Modern CSS Reset -モダンブラウザ用のリセットCSS

モダンブラウザをターゲットにしたWeb制作では、CSSにおけるブラウザの互換性の問題はIE6の頃に比べるとはるかに少なくなり、無理なリセットやすべてをリセットする必要はなくなりました。現在のWeb制作に合わせて制作された新しいリセットCSSが、この「A Modern CSS Reset」です。

すべての要素と疑似要素に対してbox-sizing: border-box;を定義し、リストやフォーム周りにも細やかな配慮がされたリセットCSSです。

/* A Modern CSS Reset */

*,*::before,*::after{box-sizing:border-box}body,h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}ul[role="list"],ol[role="list"]{list-style:none}html:focus-within{scroll-behavior:smooth}body{min-height:100vh;text-rendering:optimizeSpeed;line-height:1.5}a:not([class]){text-decoration-skip-ink:auto}img,picture{max-width:100%;display:block}input,button,textarea,select{font:inherit}@media(prefers-reduced-motion:reduce){html:focus-within{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important}}

/* A Modern CSS Reset */

*,*::before,*::after{box-sizing:border-box}body,h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0}ul[role="list"],ol[role="list"]{list-style:none}html:focus-within{scroll-behavior:smooth}body{min-height:100vh;text-rendering:optimizeSpeed;line-height:1.5}a:not([class]){text-decoration-skip-ink:auto}img,picture{max-width:100%;display:block}input,button,textarea,select{font:inherit}@media(prefers-reduced-motion:reduce){html:focus-within{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important}}

※2021/1/18のバージョン（GitHub）

上記のスタイルシートは、コメントなどを削除したものです。
各スタイルシートの詳しい説明は、以前の記事をご覧ください。

古いCSSリセットからはもう卒業！モダンブラウザに適した新しいCSSリセット -A Modern CSS Reset

CSS Remedy -後方互換性を備えた新しいリセットCSS

モダンブラウザだけをターゲットにするのが難しい場合は、この「CSS Remedy」がお勧めです。Mozilla Developerによる新しいプロジェクトで、後方互換性を備えつつ、現在のデスクトップやスマホの環境に合わせたリセットCSSです。

プロパティや値を後方互換性について心配する必要がない場合のみ定義し、CSSがデフォルトでどのように動作するべきか現代的な考えでUAスタイルを上書きすることができます。

/* CSS Remedy */
*,::after,::before{box-sizing:border-box}html{line-sizing:normal}body{margin:0}[hidden]{display:none}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.17rem}h4{font-size:1rem}h5{font-size:.83rem}h6{font-size:.67rem}h1{margin:.67em 0}pre{white-space:pre-wrap}hr{border-style:solid;border-width:1px 0 0;color:inherit;height:0;overflow:visible}audio,canvas,embed,iframe,img,object,svg,video{display:block;vertical-align:middle;max-width:100%}audio:not([controls]){display:none}picture{display:contents}source{display:none}canvas,img,svg,video{height:auto}audio{width:100%}img{border-style:none}svg{overflow:hidden}article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}

/* CSS Remedy */

*,::after,::before{box-sizing:border-box}html{line-sizing:normal}body{margin:0}[hidden]{display:none}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.17rem}h4{font-size:1rem}h5{font-size:.83rem}h6{font-size:.67rem}h1{margin:.67em 0}pre{white-space:pre-wrap}hr{border-style:solid;border-width:1px 0 0;color:inherit;height:0;overflow:visible}audio,canvas,embed,iframe,img,object,svg,video{display:block;vertical-align:middle;max-width:100%}audio:not([controls]){display:none}picture{display:contents}source{display:none}canvas,img,svg,video{height:auto}audio{width:100%}img{border-style:none}svg{overflow:hidden}article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}

※2021/4/30のバージョン（GitHub）

上記のスタイルシートは、コメントなどを削除したものです。
各スタイルシートの詳しい説明は、以前の記事をご覧ください。

CSSリセットにも新しい動きが！最近の実装に合わせて、見直すきかっけになる新しいCSSのリセット -CSS Remedy

Reboot.css -Bootstrapで採用されているリセットCSS

Reset CSSやNormalize.cssよりも使いやすく、これからのWebサイトやスマホアプリのリセットCSSとして設計された「Reboot.css」です。Bootstrapで採用されているリセットCSSで、多くの実績があるのも特徴です。

Reboot.cssはnormalize.css 2.0に似ていますが、リセット用の便利なスタイルが用意されています。

/*!
 * Bootstrap Reboot v5.3.3 (https://getbootstrap.com/)
 * Copyright 2011-2024 The Bootstrap Authors
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 */
:root,[data-bs-theme=light]{--bs-blue:#0d6efd;--bs-indigo:#6610f2;--bs-purple:#6f42c1;--bs-pink:#d63384;--bs-red:#dc3545;--bs-orange:#fd7e14;--bs-yellow:#ffc107;--bs-green:#198754;--bs-teal:#20c997;--bs-cyan:#0dcaf0;--bs-black:#000;--bs-white:#fff;--bs-gray:#6c757d;--bs-gray-dark:#343a40;--bs-gray-100:#f8f9fa;--bs-gray-200:#e9ecef;--bs-gray-300:#dee2e6;--bs-gray-400:#ced4da;--bs-gray-500:#adb5bd;--bs-gray-600:#6c757d;--bs-gray-700:#495057;--bs-gray-800:#343a40;--bs-gray-900:#212529;--bs-primary:#0d6efd;--bs-secondary:#6c757d;--bs-success:#198754;--bs-info:#0dcaf0;--bs-warning:#ffc107;--bs-danger:#dc3545;--bs-light:#f8f9fa;--bs-dark:#212529;--bs-primary-rgb:13, 110, 253;--bs-secondary-rgb:108, 117, 125;--bs-success-rgb:25, 135, 84;--bs-info-rgb:13, 202, 240;--bs-warning-rgb:255, 193, 7;--bs-danger-rgb:220, 53, 69;--bs-light-rgb:248, 249, 250;--bs-dark-rgb:33, 37, 41;--bs-primary-text-emphasis:#052c65;--bs-secondary-text-emphasis:#2b2f32;--bs-success-text-emphasis:#0a3622;--bs-info-text-emphasis:#055160;--bs-warning-text-emphasis:#664d03;--bs-danger-text-emphasis:#58151c;--bs-light-text-emphasis:#495057;--bs-dark-text-emphasis:#495057;--bs-primary-bg-subtle:#cfe2ff;--bs-secondary-bg-subtle:#e2e3e5;--bs-success-bg-subtle:#d1e7dd;--bs-info-bg-subtle:#cff4fc;--bs-warning-bg-subtle:#fff3cd;--bs-danger-bg-subtle:#f8d7da;--bs-light-bg-subtle:#fcfcfd;--bs-dark-bg-subtle:#ced4da;--bs-primary-border-subtle:#9ec5fe;--bs-secondary-border-subtle:#c4c8cb;--bs-success-border-subtle:#a3cfbb;--bs-info-border-subtle:#9eeaf9;--bs-warning-border-subtle:#ffe69c;--bs-danger-border-subtle:#f1aeb5;--bs-light-border-subtle:#e9ecef;--bs-dark-border-subtle:#adb5bd;--bs-white-rgb:255, 255, 255;--bs-black-rgb:0, 0, 0;--bs-font-sans-serif:system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--bs-font-monospace:SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--bs-gradient:linear-gradient(180deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0));--bs-body-font-family:var(--bs-font-sans-serif);--bs-body-font-size:1rem;--bs-body-font-weight:400;--bs-body-line-height:1.5;--bs-body-color:#212529;--bs-body-color-rgb:33, 37, 41;--bs-body-bg:#fff;--bs-body-bg-rgb:255, 255, 255;--bs-emphasis-color:#000;--bs-emphasis-color-rgb:0, 0, 0;--bs-secondary-color:rgba(33, 37, 41, 0.75);--bs-secondary-color-rgb:33, 37, 41;--bs-secondary-bg:#e9ecef;--bs-secondary-bg-rgb:233, 236, 239;--bs-tertiary-color:rgba(33, 37, 41, 0.5);--bs-tertiary-color-rgb:33, 37, 41;--bs-tertiary-bg:#f8f9fa;--bs-tertiary-bg-rgb:248, 249, 250;--bs-heading-color:inherit;--bs-link-color:#0d6efd;--bs-link-color-rgb:13, 110, 253;--bs-link-decoration:underline;--bs-link-hover-color:#0a58ca;--bs-link-hover-color-rgb:10, 88, 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+ 0.3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-text,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}::file-selector-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}

/*!

* Bootstrap Reboot v5.3.3 (https://getbootstrap.com/)

* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)

:root,[data-bs-theme=light]{--bs-blue:#0d6efd;--bs-indigo:#6610f2;--bs-purple:#6f42c1;--bs-pink:#d63384;--bs-red:#dc3545;--bs-orange:#fd7e14;--bs-yellow:#ffc107;--bs-green:#198754;--bs-teal:#20c997;--bs-cyan:#0dcaf0;--bs-black:#000;--bs-white:#fff;--bs-gray:#6c757d;--bs-gray-dark:#343a40;--bs-gray-100:#f8f9fa;--bs-gray-200:#e9ecef;--bs-gray-300:#dee2e6;--bs-gray-400:#ced4da;--bs-gray-500:#adb5bd;--bs-gray-600:#6c757d;--bs-gray-700:#495057;--bs-gray-800:#343a40;--bs-gray-900:#212529;--bs-primary:#0d6efd;--bs-secondary:#6c757d;--bs-success:#198754;--bs-info:#0dcaf0;--bs-warning:#ffc107;--bs-danger:#dc3545;--bs-light:#f8f9fa;--bs-dark:#212529;--bs-primary-rgb:13, 110, 253;--bs-secondary-rgb:108, 117, 125;--bs-success-rgb:25, 135, 84;--bs-info-rgb:13, 202, 240;--bs-warning-rgb:255, 193, 7;--bs-danger-rgb:220, 53, 69;--bs-light-rgb:248, 249, 250;--bs-dark-rgb:33, 37, 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1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.1875em;color:var(--bs-highlight-color);background-color:var(--bs-highlight-bg)}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:rgba(var(--bs-link-color-rgb),var(--bs-link-opacity,1));text-decoration:underline}a:hover{--bs-link-color-rgb:var(--bs-link-hover-color-rgb)}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}pre,code,kbd,samp{font-family:var(--bs-font-monospace);font-size:1em}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:var(--bs-code-color);word-wrap:break-word}a>code{color:inherit}kbd{padding:.1875rem .375rem;font-size:.875em;color:var(--bs-body-bg);background-color:var(--bs-body-color);border-radius:.25rem}kbd kbd{padding:0;font-size:1em}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:var(--bs-secondary-color);text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}thead,tbody,tfoot,tr,td,th{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}input,button,select,optgroup,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]:not([type=date]):not([type=datetime-local]):not([type=month]):not([type=week]):not([type=time])::-webkit-calendar-picker-indicator{display:none!important}button,[type=button],[type=reset],[type=submit]{-webkit-appearance:button}button:not(:disabled),[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + 0.3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-text,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}::file-selector-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}

※Reboot v5.3.3 2024/2/21 （GitHub）

Bootstrap v4のReboot.cssも掲載しておきます。

/*!
 * Bootstrap Reboot v4.6.2 (https://getbootstrap.com/)
 * Copyright 2011-2022 The Bootstrap Authors
 * Copyright 2011-2022 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
 */
*,*::before,*::after{box-sizing:border-box}html{font-family:sans-serif;line-height:1.15;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:rgba(0,0,0,0)}article,aside,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;text-align:left;background-color:#fff}[tabindex="-1"]:focus:not(:focus-visible){outline:0!important}hr{box-sizing:content-box;height:0;overflow:visible}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem}p{margin-top:0;margin-bottom:1rem}abbr[title],abbr[data-original-title]{text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;border-bottom:0;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul,dl{margin-top:0;margin-bottom:1rem}ol ol,ul ul,ol ul,ul ol{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:80%}sub,sup{position:relative;font-size:75%;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#007bff;text-decoration:none;background-color:transparent}a:hover{color:#0056b3;text-decoration:underline}a:not([href]):not([class]){color:inherit;text-decoration:none}a:not([href]):not([class]):hover{color:inherit;text-decoration:none}pre,code,kbd,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em}pre{margin-top:0;margin-bottom:1rem;overflow:auto;-ms-overflow-style:scrollbar}figure{margin:0 0 1rem}img{vertical-align:middle;border-style:none}svg{overflow:hidden;vertical-align:middle}table{border-collapse:collapse}caption{padding-top:.75rem;padding-bottom:.75rem;color:#6c757d;text-align:left;caption-side:bottom}th{text-align:inherit;text-align:-webkit-match-parent}label{display:inline-block;margin-bottom:.5rem}button{border-radius:0}button:focus:not(:focus-visible){outline:0}input,button,select,optgroup,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,input{overflow:visible}button,select{text-transform:none}[role="button"]{cursor:pointer}select{word-wrap:normal}button,[type="button"],[type="reset"],[type="submit"]{-webkit-appearance:button}button:not(:disabled),[type="button"]:not(:disabled),[type="reset"]:not(:disabled),[type="submit"]:not(:disabled){cursor:pointer}button::-moz-focus-inner,[type="button"]::-moz-focus-inner,[type="reset"]::-moz-focus-inner,[type="submit"]::-moz-focus-inner{padding:0;border-style:none}input[type="radio"],input[type="checkbox"]{box-sizing:border-box;padding:0}textarea{overflow:auto;resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{display:block;width:100%;max-width:100%;padding:0;margin-bottom:.5rem;font-size:1.5rem;line-height:inherit;color:inherit;white-space:normal}progress{vertical-align:baseline}[type="number"]::-webkit-inner-spin-button,[type="number"]::-webkit-outer-spin-button{height:auto}[type="search"]{outline-offset:-2px;-webkit-appearance:none}[type="search"]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}summary{display:list-item;cursor:pointer}template{display:none}[hidden]{display:none!important}

/*!

* Bootstrap Reboot v4.6.2 (https://getbootstrap.com/)

* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)

* Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)

*,*::before,*::after{box-sizing:border-box}html{font-family:sans-serif;line-height:1.15;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:rgba(0,0,0,0)}article,aside,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;text-align:left;background-color:#fff}[tabindex="-1"]:focus:not(:focus-visible){outline:0!important}hr{box-sizing:content-box;height:0;overflow:visible}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem}p{margin-top:0;margin-bottom:1rem}abbr[title],abbr[data-original-title]{text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;border-bottom:0;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul,dl{margin-top:0;margin-bottom:1rem}ol ol,ul ul,ol ul,ul ol{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:80%}sub,sup{position:relative;font-size:75%;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#007bff;text-decoration:none;background-color:transparent}a:hover{color:#0056b3;text-decoration:underline}a:not([href]):not([class]){color:inherit;text-decoration:none}a:not([href]):not([class]):hover{color:inherit;text-decoration:none}pre,code,kbd,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em}pre{margin-top:0;margin-bottom:1rem;overflow:auto;-ms-overflow-style:scrollbar}figure{margin:0 0 1rem}img{vertical-align:middle;border-style:none}svg{overflow:hidden;vertical-align:middle}table{border-collapse:collapse}caption{padding-top:.75rem;padding-bottom:.75rem;color:#6c757d;text-align:left;caption-side:bottom}th{text-align:inherit;text-align:-webkit-match-parent}label{display:inline-block;margin-bottom:.5rem}button{border-radius:0}button:focus:not(:focus-visible){outline:0}input,button,select,optgroup,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,input{overflow:visible}button,select{text-transform:none}[role="button"]{cursor:pointer}select{word-wrap:normal}button,[type="button"],[type="reset"],[type="submit"]{-webkit-appearance:button}button:not(:disabled),[type="button"]:not(:disabled),[type="reset"]:not(:disabled),[type="submit"]:not(:disabled){cursor:pointer}button::-moz-focus-inner,[type="button"]::-moz-focus-inner,[type="reset"]::-moz-focus-inner,[type="submit"]::-moz-focus-inner{padding:0;border-style:none}input[type="radio"],input[type="checkbox"]{box-sizing:border-box;padding:0}textarea{overflow:auto;resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{display:block;width:100%;max-width:100%;padding:0;margin-bottom:.5rem;font-size:1.5rem;line-height:inherit;color:inherit;white-space:normal}progress{vertical-align:baseline}[type="number"]::-webkit-inner-spin-button,[type="number"]::-webkit-outer-spin-button{height:auto}[type="search"]{outline-offset:-2px;-webkit-appearance:none}[type="search"]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}summary{display:list-item;cursor:pointer}template{display:none}[hidden]{display:none!important}

※Reboot v4.6.2 2022/7/20 （GitHub）

上記のスタイルシートは、コメントなどを削除したものです。
各スタイルシートの詳しい説明は、以前の記事をご覧ください。

「Reboot.css」の特徴と使い方を解説

定番のリセットCSS

Eric MeyerのCSS Reset

さすがに古いので使用するには、カスタマイズが必要だと思います。

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

a,abbr,acronym,address,applet,article,aside,audio,b,big,blockquote,body,canvas,caption,center,cite,code,dd,del,details,dfn,div,dl,dt,em,embed,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hgroup,html,i,iframe,img,ins,kbd,label,legend,li,mark,menu,nav,object,ol,output,p,pre,q,ruby,s,samp,section,small,span,strike,strong,sub,summary,sup,table,tbody,td,tfoot,th,thead,time,tr,tt,u,ul,var,video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:after,blockquote:before,q:after,q:before{content:'';content:none}table{border-collapse:collapse;border-spacing:0}

/* http://meyerweb.com/eric/tools/css/reset/

v2.0 | 20110126

License: none (public domain)

a,abbr,acronym,address,applet,article,aside,audio,b,big,blockquote,body,canvas,caption,center,cite,code,dd,del,details,dfn,div,dl,dt,em,embed,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hgroup,html,i,iframe,img,ins,kbd,label,legend,li,mark,menu,nav,object,ol,output,p,pre,q,ruby,s,samp,section,small,span,strike,strong,sub,summary,sup,table,tbody,td,tfoot,th,thead,time,tr,tt,u,ul,var,video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:after,blockquote:before,q:after,q:before{content:'';content:none}table{border-collapse:collapse;border-spacing:0}

※2011/1/26のバージョン（Eric MeyerのCSS Reset）

normalize.css

バージョンアップが重ねられ、2023年でも現役で使用できるリセットCSSです。

/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */

html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;text-decoration:underline dotted}b,strong{font-weight:bolder}code,kbd,samp{font-family:monospace,monospace;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,input{overflow:visible}button,select{text-transform:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{border-style:none;padding:0}[type=button]:-moz-focusring,[type=reset]:-moz-focusring,[type=submit]:-moz-focusring,button:-moz-focusring{outline:1px dotted ButtonText}fieldset{padding:.35em .75em .625em}legend{box-sizing:border-box;color:inherit;display:table;max-width:100%;padding:0;white-space:normal}progress{vertical-align:baseline}textarea{overflow:auto}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}details{display:block}summary{display:list-item}template{display:none}[hidden]{display:none}

/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */

html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;text-decoration:underline dotted}b,strong{font-weight:bolder}code,kbd,samp{font-family:monospace,monospace;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,input{overflow:visible}button,select{text-transform:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{border-style:none;padding:0}[type=button]:-moz-focusring,[type=reset]:-moz-focusring,[type=submit]:-moz-focusring,button:-moz-focusring{outline:1px dotted ButtonText}fieldset{padding:.35em .75em .625em}legend{box-sizing:border-box;color:inherit;display:table;max-width:100%;padding:0;white-space:normal}progress{vertical-align:baseline}textarea{overflow:auto}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}details{display:block}summary{display:list-item}template{display:none}[hidden]{display:none}

※normalize.css v8.0.1 2018/11/5のバージョン（GitHub）
参考: CSSリセットとは異なる、Normalize.cssの特徴や使い方などの解説

sanitize.css

reset.cssとnormalize.cssに続くリセットCSS。

size:1em;overflow:auto}:where(abbr[title]){text-decoration:underline;text-decoration:underline dotted}:where(b,strong){font-weight:bolder}:where(code,kbd,samp){font-family:monospace,monospace;font-size:1em}:where(small){font-size:80%}:where(audio,canvas,iframe,img,svg,video){vertical-align:middle}:where(iframe){border-style:none}:where(svg:not([fill])){fill:currentColor}:where(table){border-collapse:collapse;border-color:currentColor;text-indent:0}:where(button,input,select){margin:0}:where(button,[type="button" i],[type="reset" i],[type="submit" i]){-webkit-appearance:button}:where(fieldset){border:1px solid #a0a0a0}:where(progress){vertical-align:baseline}:where(textarea){margin:0;resize:vertical}:where([type="search" i]){-webkit-appearance:textfield;outline-offset:-2px}::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}::-webkit-input-placeholder{color:inherit;opacity:0.54}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}:where(dialog){background-color:white;border:solid;color:black;height:-moz-fit-content;height:fit-content;left:0;margin:auto;padding:1em;position:absolute;right:0;width:-moz-fit-content;width:fit-content}:where(dialog:not([open])){display:none}:where(details>summary:first-of-type){display:list-item}:where([aria-busy="true" i]){cursor:progress}:where([aria-disabled="true" i],[disabled]){cursor:not-allowed}:where([aria-hidden="false" i][hidden]){display:initial}:where([aria-hidden="false" i][hidden]:not(:focus)){clip:rect(0,0,0,0);position:absolute}

size:1em;overflow:auto}:where(abbr[title]){text-decoration:underline;text-decoration:underline dotted}:where(b,strong){font-weight:bolder}:where(code,kbd,samp){font-family:monospace,monospace;font-size:1em}:where(small){font-size:80%}:where(audio,canvas,iframe,img,svg,video){vertical-align:middle}:where(iframe){border-style:none}:where(svg:not([fill])){fill:currentColor}:where(table){border-collapse:collapse;border-color:currentColor;text-indent:0}:where(button,input,select){margin:0}:where(button,[type="button" i],[type="reset" i],[type="submit" i]){-webkit-appearance:button}:where(fieldset){border:1px solid #a0a0a0}:where(progress){vertical-align:baseline}:where(textarea){margin:0;resize:vertical}:where([type="search" i]){-webkit-appearance:textfield;outline-offset:-2px}::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}::-webkit-input-placeholder{color:inherit;opacity:0.54}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}:where(dialog){background-color:white;border:solid;color:black;height:-moz-fit-content;height:fit-content;left:0;margin:auto;padding:1em;position:absolute;right:0;width:-moz-fit-content;width:fit-content}:where(dialog:not([open])){display:none}:where(details>summary:first-of-type){display:list-item}:where([aria-busy="true" i]){cursor:progress}:where([aria-disabled="true" i],[disabled]){cursor:not-allowed}:where([aria-hidden="false" i][hidden]){display:initial}:where([aria-hidden="false" i][hidden]:not(:focus)){clip:rect(0,0,0,0);position:absolute}

※sanitize.css 13.0.0 2021/9/14のバージョン（GitHub）
参考: reset.cssとnormalize.cssに続く新しいリセット用CSS、モバイル対応・最近の実装スタイルを考慮したスタイルシート -sanitize.css