Tag in comment
pentingnya: 3
What does this code show?
<script> let body = document.body; body.innerHTML = "<!--" + body.tagName + "-->"; alert( body.firstChild.data ); // what's here? </script>The answer: BODY.
<script> let body = document.body; body.innerHTML = "<!--" + body.tagName + "-->"; alert( body.firstChild.data ); // BODY </script>What’s going on step by step:
- The content of
<body>is replaced with the comment. The comment is<!--BODY-->, becausebody.tagName == "BODY". As we remember,tagNameis always uppercase in HTML. - The comment is now the only child node, so we get it in
body.firstChild. - The
dataproperty of the comment is its contents (inside<!--...-->):"BODY".