Text Input with Expanding Bottom Border

Petr Gazarov published a pretty rad little design pattern in his article Text input highlight, TripAdvisor style.

Typing animation in which a yellow border matches the length of the text inside.

It’s a trick! You can’t really make an <input> stretch like that, so Petr makes a <span> to sync the value too, which acts as the border itself. The whole thing is a React component.

If you’re willing to use a <span contenteditable> instead, you could do the whole thing in CSS!

See the Pen Outline bottom by Chris Coyier (@chriscoyier) on CodePen.

Although that also means no placeholder.

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Text Input with Expanding Bottom Border is a post from CSS-Tricks

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