Tag Archives: polyfill

Polyfilling CSS with CSS Parser Extensions

In April I attended #BlinkOn, the conference for web platform contributors in the Chromium open source project. At the conference I gave a presentation about “CSS Parser Extensions”, a wild idea I have to fix CSS polyfilling once and for all.

If you didn’t know, polyfilling CSS features is extremely hard, mainly because the CSS Parser discards what it does not understand. So what if, instead of having authors write their own parser and cascade to polyfill a CSS feature, they could teach the parser some new tricks?

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A first look at container-query-polyfill, a polyfill for CSS Container Queries

Surma has been working on container-query-polyfill, a lightweight polyfill for CSS Container Queries. Let’s take a look at how it works and how it differs from cqfill … What Unlike cqfill —which was covered here before— this Polyfill for Container Queries: Does not require you to declare a separate Custom Property –css-contain that duplicates the …

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Support Import Maps in any browser with es-module-shims

JavaScript Import Maps – which I wrote about earlier here — are a great addition to the web. Unfortunately they’re only supported in Chromium 89+. Thankfully there’s a polyfill available: es-module-shims. As long as your browser has baseline ES Module Support (Chrome 61+, Firefox 60+, Safari 10.1+, and Edge 17+) the polyfill will work. To …

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Polyfill.io

Interesting service by Polyfill.io. Just include their polyfill.js file and it’ll include a set of polyfills specifically for the browser used: <script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script> Polyfill.io reads the User-Agent header of each request and returns polyfills that are suitable for the requesting browser. This one could come in handy for older projects that have gathered some dust …

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CSS-Grid-Polyfill

CSS Grid Layout Polyfill: The polyfill’s css parser was built by following the CSS Syntax 3 specification, the polyfill should be able to process any css stylesheet. It can react to dynamic pseudo-classes like ‘:hover’, to media queries changes or window resize events. It also detects changes to the DOM that may affect the layout …

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CSS conic-gradient() Polyfill

<script src=”https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js”></script> <script src=”conic-gradient.js”></script> Conic gradients are awesome, but browsers haven’t realized yet. This polyfill lets you experiment with them now. By Lea Verou. Automatically creates an SVG which is set as the background. Uses -prefix-free. Alternatively you can also use the JavaScript API behind it directly: var gradient = new ConicGradient({ stops: “gold 40%, …

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X-Tag: Web Components’ Custom Elements Polyfill

X-Tag is a powerful sugar library primarily focused on wrapping and enhancing one of the draft-state Web Component specs: Custom Elements With Custom Elements, you could for example just write up <x-map data-key="6c86bb5b30a442c180772d978f3ae000"></x-map> in your HTML and have it rendered as a full blown map. Speed Up App Development with X-Tag and Web Components →X-Tag …

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