Question

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Why split the <script> tag when writing it with document.write()?

Looking at the enyo source, I see this (in enyo.js):

document.write('<scri' + 'pt src="' + root + "/source/boot/" + inSrc + '"></scri' + 'pt>');

Why is the <script tag broken into <scri + pt ? The same is done for the end tag. Is this a secret of the Javascript ninja that I’m not aware of?

Answer 1

When a browser’s html parser sees the string "</script>", regardless of whether it is in a javascript string or not, it sees it as a closing script tag and ends the current script block. Breaking the "</script>" tag into two pieces prevents this from happening when you need it as a javascript string.

See this explanation:

the tag is content-agnostic. Which means the HTML Parser
doesn’t know we’re in the middle of a JavaScript string.

The processing of JavaScript doesn’t happen until after the browser
has understood which parts are JavaScript. Until it sees that close
tag, it doesn’t care what’s inside – quoted or not.