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f1801fb1d2
This matches the prototype attributes. Used by https://chatgpt.com/, where it runs this code: ```js CSS.supports('animation-timeline: --works') ``` If this returns false, it will attempt to polyfill Animation Timeline and override CSS.supports to support Animation Timeline properties.
38 lines
1.6 KiB
HTML
38 lines
1.6 KiB
HTML
<!DOCTYPE html>
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<script src="include.js"></script>
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<script>
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test(() => {
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"use strict";
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println("== CSS property descriptors");
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const cssNamespaceDescriptors = Object.getOwnPropertyDescriptors(CSS);
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const cssNamespaceKeys = Object.keys(cssNamespaceDescriptors);
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for (const key of cssNamespaceKeys) {
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const descriptor = cssNamespaceDescriptors[key];
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println(`${key} writable: ${descriptor.writable}`);
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println(`${key} configurable: ${descriptor.configurable}`);
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println(`${key} enumerable: ${descriptor.enumerable}`);
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if (descriptor.writable) {
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println(`${key} value before: ${CSS[key]}`);
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CSS[key] = "replaced";
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println(`${key} value after: ${CSS[key]}`);
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}
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}
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println("== WebAssembly property descriptors");
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const wasmNamespaceDescriptors = Object.getOwnPropertyDescriptors(WebAssembly);
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const wasmNamespaceKeys = Object.keys(wasmNamespaceDescriptors);
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for (const key of wasmNamespaceKeys) {
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const descriptor = wasmNamespaceDescriptors[key];
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println(`${key} writable: ${descriptor.writable}`);
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println(`${key} configurable: ${descriptor.configurable}`);
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println(`${key} enumerable: ${descriptor.enumerable}`);
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if (descriptor.writable) {
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println(`${key} value before: ${WebAssembly[key]}`);
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WebAssembly[key] = "replaced";
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println(`${key} value after: ${WebAssembly[key]}`);
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}
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}
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});
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</script>
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