All three UI patterns are commonly found in design systems, with many lines of JavaScript to implement custom styling, presentation, layout, interaction, or accessibility patterns.

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Web apps, obviously, benefit from a huge selection of tools, frameworks, and extensions. Several cross-platform mobile application frameworks are using HTML for UI design, and even desktop apps can ...

CSS: Enter CSS to be applied to the HTML used in your tests. It is placed between <style> elements in the header portion of the page. HTML: This area allows you to enter HTML to be used in your tests.