94 lines
2.7 KiB
Markdown
94 lines
2.7 KiB
Markdown
### Hover underline animation
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Creates an animated underline effect when the text is hovered over.
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<small>**Credit:** https://flatuicolors.com/</small>
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#### HTML
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```html
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<p class="hover-underline-animation">Hover this text to see the effect!</p>
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```
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#### CSS
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```css
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.hover-underline-animation {
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display: inline-block;
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position: relative;
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color: #0087ca;
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}
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.hover-underline-animation::after {
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content: '';
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position: absolute;
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width: 100%;
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transform: scaleX(0);
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height: 2px;
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bottom: 0;
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left: 0;
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background-color: #0087ca;
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transform-origin: bottom right;
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transition: transform 0.25s ease-out;
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}
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.hover-underline-animation:hover::after {
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transform: scaleX(1);
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transform-origin: bottom left;
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}
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```
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#### Demo
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<div class="snippet-demo">
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<p class="snippet-demo__hover-underline-animation">Hover this text to see the effect!</p>
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</div>
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<style>
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.snippet-demo__hover-underline-animation {
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display: inline-block;
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position: relative;
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color: #0087ca;
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}
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.snippet-demo__hover-underline-animation::after {
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content: '';
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position: absolute;
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width: 100%;
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transform: scaleX(0);
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height: 2px;
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bottom: 0;
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left: 0;
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background-color: #0087ca;
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transform-origin: bottom right;
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transition: transform 0.25s ease-out;
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}
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.snippet-demo__hover-underline-animation:hover::after {
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transform: scaleX(1);
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transform-origin: bottom left;
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}
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</style>
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#### Explanation
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1. `display: inline-block` makes the block `p` an `inline-block` to prevent the underline from
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spanning the entire parent width rather than just the content (text).
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2. `position: relative` on the element establishes a Cartesian positioning context for pseudo-elements.
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3. `::after` defines a pseudo-element.
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4. `position: absolute` takes the pseudo element out of the flow of the document and positions it in relation to the parent.
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5. `width: 100%` ensures the pseudo-element spans the entire width of the text block.
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6. `transform: scaleX(0)` initially scales the pseudo element to 0 so it has no width and is not visible.
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7. `bottom: 0` and `left: 0` position it to the bottom left of the block.
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8. `transition: transform 0.25s ease-out` means changes to `transform` will be transitioned over 0.25 seconds
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with an `ease-out` timing function.
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9. `transform-origin: bottom right` means the transform anchor point is positioned at the bottom right of the block.
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10. `:hover::after` then uses `scaleX(1)` to transition the width to 100%, then changes the `transform-origin`
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to `bottom left` so that the anchor point is reversed, allowing it transition out in the other direction when
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hovered off.
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#### Browser support
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<span class="snippet__support-note">✅ No caveats.</span>
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* https://caniuse.com/#feat=transforms2d
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* https://caniuse.com/#feat=css-transitions
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<!-- tags: animation -->
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