Add multiline truncate text

snippets/truncate-text-multiline.md

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+### Truncate text multiline
+
+If the text is longer than one line, it will be truncated for `n` lines and end with an ellipsis `…`.
+
+#### HTML
+
+```html
+<p class="truncate-text-multiline">
+  Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut
+  labore et.
+</p>
+```
+
+#### CSS
+
+```css
+.truncate-text-multiline {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  display: block;
+  display: -webkit-box;
+  height: 109.2px;
+  margin: 0 auto;
+  font-size: 26px;
+  line-height: 1.4;
+  -webkit-line-clamp: 3;
+  -webkit-box-orient: vertical;
+  width: 400px;
+}
+```
+
+#### Demo
+
+#### Explanation
+
+1. `overflow: hidden` prevents the text from overflowing its dimensions
+   (for a block, 100% width and auto height).
+2. `text-overflow: ellipsis` makes it so that if the text exceeds its dimensions, it
+   will end with an ellipsis.
+3. `width: 400px` ensures the element has a dimension, to know when to get ellipsis
+4. `display: -webkit-box` attribute that allows to work with `line-clamp`
+5. `-webkit-line-clamp: 3` number of lines to be truncated (in this case there will be only 3 visible lines)
+6. `-webkit-box-orient: horizontal` specify that text will go vertically
+7. `display: block` fallback for unsupported browsers
+8. `height: 109.2px` fallback, calculated value for height, it equals `font-size * line-height * numberOfLines` (in this case `26 * 1.4 * 3 = 109.2`)
+
+#### Browser support
+
+<span class="snippet__support-note">⚠️ Requires prefix for full support.</span>
+
+- https://caniuse.com/#feat=css-line-clamp
+
+<!-- tags: layout -->