Created
September 9, 2023 12:40
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Modified css-scope-inline
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| // Original: https://github.com/gnat/css-scope-inline | |
| // Modified: https://gist.github.com/Gyanreyer/a9d5fe8b91055ea4dc302c1d0ff17452 | |
| (() => { | |
| let cssScopeCount = 0; | |
| const scopedSelectorRegex = new RegExp('(:scope)(?![A-Za-z0-9_-])', 'g'); | |
| /** @returns {Node[]} */ | |
| const getAllChildNodes = (/** @type {NodeList} */ childNodes) => | |
| [...childNodes].flatMap((childNode) => [ | |
| childNode, | |
| ...getAllChildNodes(childNode.childNodes), | |
| ]); | |
| new MutationObserver((mutations) => { | |
| for (const mutation of mutations) { | |
| if (mutation.type !== 'childList' || mutation.addedNodes.length === 0) { | |
| continue; | |
| } | |
| const addedNodesWithAllTheirChildren = getAllChildNodes( | |
| mutation.addedNodes | |
| ); | |
| for (const addedNode of addedNodesWithAllTheirChildren) { | |
| if (addedNode.nodeName !== 'STYLE') { | |
| // Must be a <style> tag | |
| continue; | |
| } | |
| const parentElement = addedNode.parentElement; | |
| if (!parentElement || parentElement.tagName === 'HEAD') { | |
| // Must have a parent outside of the <head> | |
| continue; | |
| } | |
| const textContent = addedNode.textContent; | |
| if (!textContent) { | |
| // Must have content | |
| continue; | |
| } | |
| let scopedSelector; | |
| const existingScope = addedNode.parentElement.dataset.scope; | |
| if (existingScope) { | |
| scopedSelector = `[data-scope="${existingScope}"]`; | |
| } else { | |
| // Increment the scope count to make it unique for this <style> tag | |
| cssScopeCount++; | |
| // Add unique scope data attribute, example: data-scope="1234" | |
| addedNode.parentElement.dataset.scope = String(cssScopeCount); | |
| scopedSelector = `[data-scope="${cssScopeCount}"]`; | |
| } | |
| addedNode.textContent = textContent.replace( | |
| scopedSelectorRegex, | |
| scopedSelector | |
| ); | |
| } | |
| } | |
| }).observe(document.documentElement, { childList: true, subtree: true }); | |
| })(); |
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