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web開発時に役立つスニペット
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web-dev-snippets.md

すべての要素に対して赤枠を指定する

Array.from(document.getElementsByTagName("*")).map(e => e.style.border = "1px solid red");

すべての要素に対してアウトラインだけ赤枠を指定する

Array.from(document.getElementsByTagName("*")).map(e => e.style.outline = "1px solid red");
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