!default is a Sass flag that indicates conditional assignment to a variable — it assigns a value only if the variable was previously undefined or null. Consider this code snippet: $variable: 'test' !default; To the Sass compiler, this line …
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https://css-tricks.com/creating-stylesheet-feature-flags-with-sass-default/
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Okay, nobody is an exaggeration, but have you seen the stats for hwb()
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Using scroll shadows, especially for mobile devices, is a subtle bit of UX that Chris has covered before. Geoff covered a newer approach that uses the animation-timeline
property. Here

The CSS shape()
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prope


Let’s run through a quick refresher. Image maps date all the way back to HTML 3.2, where, first, server-side maps and then client-side maps defined clickable regions over an image using map and are