We have new properties in CSS for styling underlines, as explained here by Jen Simmons.
Removing underlines from links in HTML text presents an accessibility challenge. In order for a design to be considered accessible, there is now a three-sided design contraint - or what I call "The Contrast Triangle". Your text, links and background colors must now all have sufficient contrast from each other. Links must have a contrast ratio of 3:1 from their surrounding text. By not using underlines, a design has to rely on contrast alone to achieve this.
Cassie Evans shows us how to combine
background-image and a keyframe animation (all in HTML and CSS) for a lovely progressive underline effect on multi-line text.
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