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The CSS Media Pseudo Classes Polyfill is now available on npm. This post covers what shipped, what I learned about the CSSOM and unsupported CSS, how you can try it, and what comes next.
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What happens when you try to implement two seemingly straightforward CSS features as a JavaScript polyfill? You discover that specifications are simple because they made hard decisions, and the complexity does not disappear; it just moves.
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Learn how to use the new CSS ::details-content pseudo-element to style the content area of HTML details elements with greater control and flexibility.