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function copyStyles(sourceDoc, targetDoc) { | |
Array.from(sourceDoc.styleSheets).forEach(styleSheet => { | |
if (styleSheet.cssRules) { // for <style> elements | |
const newStyleEl = sourceDoc.createElement('style'); | |
Array.from(styleSheet.cssRules).forEach(cssRule => { | |
// write the text of each rule into the body of the style element | |
newStyleEl.appendChild(sourceDoc.createTextNode(cssRule.cssText)); | |
}); | |
targetDoc.head.appendChild(newStyleEl); | |
} else if (styleSheet.href) { // for <link> elements loading CSS from a URL | |
const newLinkEl = sourceDoc.createElement('link'); | |
newLinkEl.rel = 'stylesheet'; | |
newLinkEl.href = styleSheet.href; | |
targetDoc.head.appendChild(newLinkEl); | |
} | |
}); | |
} |
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