You have a “card” component which includes a heading, some text, an image, and a link to the full article, and it’s working great. Then along comes a UX requirement that the full card (not just the button or link) should be clickable. This is where things get complicated.
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.
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