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Javascript in head tag


kaivan1986

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We don't, always. Placing JavaScript within the head means it's executed before the page is loaded. JavaScript within the body is executed as that point in the mark-up is parsed - if that makes sense?

 

Think of having one external JavaScript within the head called "pre-load.js", and one just before the closing body tag called "post-load.js". Of course if you try to interact with the DOM in a pre-load script it won't work, as it doesn't exist. So executing code pre-load is quite limited, and is why people wrap it within an onload event.

 

The reason more and more people are starting to include a script before the closing body tag, is to allow the page to load faster and escape using the onload event.

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