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27 lines
735 B
JavaScript
27 lines
735 B
JavaScript
/*
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This file basically checks support for Anchor Positioning API in the browser,
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and then loads the Oddbird polyfill if support is lacking.
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*/
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let polyfillPromise;
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// look for `anchorName` in the computed styles
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const supportsAnchorPositioning = ()=>'anchorName' in document.documentElement.style;
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export const bootstrapAnchorPositioningPolyfill = ()=>{
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if(supportsAnchorPositioning()) return Promise.resolve(false);
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if(polyfillPromise) return polyfillPromise;
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polyfillPromise = (async ()=>{
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try {
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const { default: polyfill } = await import('@oddbird/css-anchor-positioning/fn');
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await polyfill();
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return true;
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} catch (error){
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polyfillPromise = undefined;
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throw error;
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}
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})();
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return polyfillPromise;
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}; |