CSSのボックスモデルの構造をCSSアニメーションで可視化

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Post on:2021年2月1日

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CSSのボックスモデルの構造をCSSアニメーションで可視化したインタラクティブなデモを紹介します。

こういうのを実装する機会は限られますが、何かあった時にやってみたいですね。

CSSのボックスモデルをCSSアニメーションで可視化

最近のボックスモデルについての詳しい解説は、以前の記事をご覧ください。

CSSのボックスモデルにおける古い方法とこれからの方法

実際の動作は、下記でお楽しみください。
サイズがここだと小さいので、下部の0.5xか上部のEditから見るとよいです。

See the Pen
Explode A Node: 3D Box Model by Adam Argyle (@argyleink)
on CodePen.

実装コードは、下記の通り。

<div class="stack">
  <div class="content card">
    <p><b><span id="desktop-prompt">Hover</span><span id="mobile-prompt">Tap</span> me!</b></p>
  </div>
  <div class="padding card"></div>
  <div class="border card"></div>
  <div class="background card"></div>
  <div class="box-shadow card"></div>
</div>

<p><b><span id="desktop-prompt">Hover</span><span id="mobile-prompt">Tap</span> me!</b></p>

</div>

</div>

CSSの表現力もかなりパワーアップしていますね。

@use postcss-preset-env {
  stage: 0
}

.stack {
  display: grid;
  grid: [stack] / [stack];
  perspective: 5000;
  
  &:before {
    content: "";
    position: fixed;
    inset: 0;
    background: lch(95 0 0);
    transition: background 2s ease;
    pointer-events: none;
  }
  
  &:matches(:hover, :active) {
    &:before {
      background: lch(15 0 0);
    }
  }
  
  &:matches(:hover, :active) .card {
    --bg-opacity: 5%;
    transition-duration: 2s;
    transition-timing-function: var(--easeInOutCirc);
    transform: 
      rotateX(45deg) rotate(45deg) 
      translateZ(var(--z-offset)) translateY(20vh) translateX(20vh)
    ;
    
    &:nth-child(1) { --z-offset: 75vh; }
    &:nth-child(2) { --z-offset: 50vh; }
    &:nth-child(3) { --z-offset: 25vh; }
    &:nth-child(4) { --z-offset: 0vh; }
    &:nth-child(5) { --z-offset: -25vh; }
    
    &:nth-child(1)::after { transition-delay: 1.5s; }
    &:nth-child(2)::after { transition-delay: 1.7s; }
    &:nth-child(3)::after { transition-delay: 1.9s; }
    &:nth-child(4)::after { transition-delay: 2.1s; }
    &:nth-child(5)::after { transition-delay: 2.3s; }
    
    &::after {
      opacity: 1;
      transform: rotate(-45deg) rotateY(45deg) translateX(0px);
    }
    
    &.content {
      background: transparent;
      color: white;
      border-color: transparent;
      transition: 
        border-color 1s var(--easeInOutCirc) 0s,
        background-color 1s var(--easeInOutCirc) 0s,
        color 1s var(--easeInOutCirc) 0s,
        transform 2s var(--easeInOutCirc) 0s;
    } 
    
    &.padding {
      transition-delay: .1s;
    }
    
    &.border {
      transition-delay: .2s;
    }
    
    &.background {
      background: white;
      transition: 
        background-color 2s var(--easeInOutCirc) .3s, 
        transform 2s var(--easeInOutCirc) .2s;
    }
    
    &.box-shadow {
      transition-delay: .4s;
      box-shadow:
        0 -1px 25px rgba(0, 0, 0, 0.4),
        0 7.6px 6.1px rgba(0, 0, 0, 0.051),
        0 14.3px 11.5px rgba(0, 0, 0, 0.059),
        0 25.5px 20.5px rgba(0, 0, 0, 0.07),
        0 47.6px 38.4px rgba(0, 0, 0, 0.094),
        0 114px 92px rgba(0, 0, 0, 0.19)
      ;
    }
  }
}

.card {
  grid-area: stack;
  
  --z-offset: 0;
  --easeInOutCirc: cubic-bezier(0.85, 0, 0.15, 1);
  --bg-opacity: 0%;
  
  transition: transform 4s ease;
  
  inline-size: 40vmin;
  block-size: 40vmin;
  box-sizing: border-box;
  color: white;
  box-siing: border-box;
  background: lch(100 0 0 / 5%);
  position: relative;
  
  @media (orientation: landscape) {
    inline-size: 40vh;
    block-size: 40vh;
  }
  
  @media (max-width: 540px) {
    inline-size: 60vw;
    block-size: 60vw;
  }
  
  &:nth-child(1) {
    z-index: 3;
  }
  
  &:nth-child(2) {
    z-index: 2;
  }
  
  &::after {
    content: "Box";
    position: absolute;
    left: -45%;
    top: 110%;
    font-size: 1.25rem;
    text-shadow: 0 1px 3px lch(0 0 0 / 75%);
    white-space: nowrap;
    padding: 1ch 2ch;
    border-radius: 4ch;
    opacity: 0;
    transition: opacity .5s ease 0s, transform .5s ease;
    transform: rotate(-45deg) rotateY(45deg) translateX(20px);
    background: lch(0 0 0 / 70%);
    
    @media (max-width: 540px) {
      left: -20%;
      top: 70%;
    }
  }
  
  &.content {
    z-index: 5;
    transition: 
      border-color 4s ease,
      background-color 5s ease 2s,
      color 4s ease 0s,
      transform 4s ease 0s;
    padding: 5vmin;
    font-size: max(2.5vmin, .9rem);
    line-height: 1.5;
    background: lch(100 0 0);
    border: 5px solid hotpink;
    color: black;
    
    &::after { 
      content: "Content Box"; 
      left: -50%;
      
      @media (max-width: 540px) {
        left: -23%;
      }
    }
  }
  
  &.padding {
    background: transparent;
    z-index: 4;
    transition-delay: .1s;
    
    &::after { content: "Padding Box"; }
    &::before {
      content: "";
      position: absolute;
      inset: 0;
      clip-path: polygon(
        0% 0%, 0% 100%, 
        5vmin 100%, 5vmin 5vmin, 
        calc(100% - 5vmin) 5vmin, 
        calc(100% - 5vmin) calc(100% - 5vmin), 
        5vmin calc(100% - 5vmin), 5vmin 100%, 
        100% 100%, 100% 0%
      );
      background: repeating-linear-gradient(
        -45deg, 
        cyan, cyan 1px, 
        lch(100 0 0 / 5%) 1px, lch(100 0 0 / 5%) 10px
      );
    }
  }
  
  &.border {
    z-index: 3;
    background: transparent;
    transition-delay: .2s;
    
    &::after { content: "Border Box"; }
    &::before {
      content: "";
      position: absolute;
      inset: 0;
      clip-path: polygon(
        0% 0%, 0% 100%, 
        5px 100%, 5px 5px, 
        calc(100% - 5px) 5px, 
        calc(100% - 5px) calc(100% - 5px), 
        5px calc(100% - 5px), 5px 100%, 
        100% 100%, 100% 0%
      );
      background: linear-gradient(hotpink, hotpink);
    }
  }
  
  &.background {
    z-index: 2;
    transition: 
      background-color 4s ease .3s,
      transform 4s ease .3s; 

    &::after { content: "Background Box"; }
  }
  
  &.box-shadow {
    z-index: 1;
    background: transparent;
    transition: 
      box-shadow 4s ease .4s,
      transform 4s ease .4s; 
    
    box-shadow:
      0 2.8px 2.2px rgba(0, 0, 0, 0.02),
      0 6.7px 5.3px rgba(0, 0, 0, 0.028),
      0 12.5px 10px rgba(0, 0, 0, 0.035),
      0 22.3px 17.9px rgba(0, 0, 0, 0.042),
      0 41.8px 33.4px rgba(0, 0, 0, 0.05),
      0 100px 80px rgba(0, 0, 0, 0.07)
    ;

    
    &::after { content: "Shadow Box"; }
  }
}

body {
  min-block-size: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui;
  background: lch(30 0 0);
}

p:first-of-type {
  margin-block-start: 0;
}

@media (hover:hover) {
  #mobile-prompt {
    display: none;
  }
} 

@media (hover:none) {
  #desktop-prompt {
    display: none;
  }
}

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@use postcss-preset-env {

stage: 0

}

.stack {

display: grid;

grid: [stack] / [stack];

perspective: 5000;

&:before {

content: "";

position: fixed;

inset: 0;

background: lch(95 0 0);

transition: background 2s ease;

pointer-events: none;

}

&:matches(:hover, :active) {

&:before {

background: lch(15 0 0);

}

&:matches(:hover, :active) .card {

--bg-opacity: 5%;

transition-duration: 2s;

transition-timing-function: var(--easeInOutCirc);

transform:

rotateX(45deg) rotate(45deg)

translateZ(var(--z-offset)) translateY(20vh) translateX(20vh)

;

&:nth-child(1) { --z-offset: 75vh; }

&:nth-child(2) { --z-offset: 50vh; }

&:nth-child(3) { --z-offset: 25vh; }

&:nth-child(4) { --z-offset: 0vh; }

&:nth-child(5) { --z-offset: -25vh; }

&:nth-child(1)::after { transition-delay: 1.5s; }

&:nth-child(2)::after { transition-delay: 1.7s; }

&:nth-child(3)::after { transition-delay: 1.9s; }

&:nth-child(4)::after { transition-delay: 2.1s; }

&:nth-child(5)::after { transition-delay: 2.3s; }

&::after {

opacity: 1;

transform: rotate(-45deg) rotateY(45deg) translateX(0px);

}

&.content {

background: transparent;

color: white;

border-color: transparent;

transition:

border-color 1s var(--easeInOutCirc) 0s,

background-color 1s var(--easeInOutCirc) 0s,

color 1s var(--easeInOutCirc) 0s,

transform 2s var(--easeInOutCirc) 0s;

}

&.padding {

transition-delay: .1s;

}

&.border {

transition-delay: .2s;

}

&.background {

background: white;

transition:

background-color 2s var(--easeInOutCirc) .3s,

transform 2s var(--easeInOutCirc) .2s;

}

&.box-shadow {

transition-delay: .4s;

box-shadow:

0 -1px 25px rgba(0, 0, 0, 0.4),

0 7.6px 6.1px rgba(0, 0, 0, 0.051),

0 14.3px 11.5px rgba(0, 0, 0, 0.059),

0 25.5px 20.5px rgba(0, 0, 0, 0.07),

0 47.6px 38.4px rgba(0, 0, 0, 0.094),

0 114px 92px rgba(0, 0, 0, 0.19)

;

}

.card {

grid-area: stack;

--z-offset: 0;

--easeInOutCirc: cubic-bezier(0.85, 0, 0.15, 1);

--bg-opacity: 0%;

transition: transform 4s ease;

inline-size: 40vmin;

block-size: 40vmin;

box-sizing: border-box;

color: white;

box-siing: border-box;

background: lch(100 0 0 / 5%);

position: relative;

@media (orientation: landscape) {

inline-size: 40vh;

block-size: 40vh;

}

@media (max-width: 540px) {

inline-size: 60vw;

block-size: 60vw;

}

&:nth-child(1) {

z-index: 3;

}

&:nth-child(2) {

z-index: 2;

}

&::after {

content: "Box";

position: absolute;

left: -45%;

top: 110%;

font-size: 1.25rem;

text-shadow: 0 1px 3px lch(0 0 0 / 75%);

white-space: nowrap;

padding: 1ch 2ch;

border-radius: 4ch;

opacity: 0;

transition: opacity .5s ease 0s, transform .5s ease;

transform: rotate(-45deg) rotateY(45deg) translateX(20px);

background: lch(0 0 0 / 70%);

@media (max-width: 540px) {

left: -20%;

top: 70%;

}

&.content {

z-index: 5;

transition:

border-color 4s ease,

background-color 5s ease 2s,

color 4s ease 0s,

transform 4s ease 0s;

padding: 5vmin;

font-size: max(2.5vmin, .9rem);

line-height: 1.5;

background: lch(100 0 0);

border: 5px solid hotpink;

color: black;

&::after {

content: "Content Box";

left: -50%;

@media (max-width: 540px) {

left: -23%;

}

&.padding {

background: transparent;

z-index: 4;

transition-delay: .1s;

&::after { content: "Padding Box"; }

&::before {

content: "";

position: absolute;

inset: 0;

clip-path: polygon(

0% 0%, 0% 100%,

5vmin 100%, 5vmin 5vmin,

calc(100% - 5vmin) 5vmin,

calc(100% - 5vmin) calc(100% - 5vmin),

5vmin calc(100% - 5vmin), 5vmin 100%,

100% 100%, 100% 0%

);

background: repeating-linear-gradient(

-45deg,

cyan, cyan 1px,

lch(100 0 0 / 5%) 1px, lch(100 0 0 / 5%) 10px

);

}

&.border {

z-index: 3;

background: transparent;

transition-delay: .2s;

&::after { content: "Border Box"; }

&::before {

content: "";

position: absolute;

inset: 0;

clip-path: polygon(

0% 0%, 0% 100%,

5px 100%, 5px 5px,

calc(100% - 5px) 5px,

calc(100% - 5px) calc(100% - 5px),

5px calc(100% - 5px), 5px 100%,

100% 100%, 100% 0%

);

background: linear-gradient(hotpink, hotpink);

}

&.background {

z-index: 2;

transition:

background-color 4s ease .3s,

transform 4s ease .3s;

&::after { content: "Background Box"; }

}

&.box-shadow {

z-index: 1;

background: transparent;

transition:

box-shadow 4s ease .4s,

transform 4s ease .4s;

box-shadow:

0 2.8px 2.2px rgba(0, 0, 0, 0.02),

0 6.7px 5.3px rgba(0, 0, 0, 0.028),

0 12.5px 10px rgba(0, 0, 0, 0.035),

0 22.3px 17.9px rgba(0, 0, 0, 0.042),

0 41.8px 33.4px rgba(0, 0, 0, 0.05),

0 100px 80px rgba(0, 0, 0, 0.07)

;

&::after { content: "Shadow Box"; }

}

body {

min-block-size: 100vh;

display: flex;

align-items: center;

justify-content: center;

font-family: system-ui;

background: lch(30 0 0);

}

p:first-of-type {

margin-block-start: 0;

}

@media (hover:hover) {

#mobile-prompt {

display: none;

}

@media (hover:none) {

#desktop-prompt {

display: none;

}

CSSのボックスモデルの構造をCSSアニメーションで可視化

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CSSのボックスモデルの構造をCSSアニメーションで可視化

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Recnet Entry

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Category

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