hugo/themes/gohugoioTheme/assets/js/codeblocks.js

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JavaScript
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let article = document.getElementById('prose')
if (article) {
let codeBlocks = article.getElementsByTagName('code')
for (let [key, codeBlock] of Object.entries(codeBlocks)){
var widthDif = codeBlock.scrollWidth - codeBlock.clientWidth
if (widthDif > 0)
codeBlock.parentNode.classList.add('expand')
}
}