As mentioned above, for years there has been a bad situation wherein the two major browsers supported different versions of the DOM. Performance is slightly improved because your browser caches the included file; therefore, having a local copy in memory next time it is needed by this or another page.
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Having them in the head means they're always ready before they're needed. A compiled programming language must first go through an external compiler before it can be executed. Because of the simplicity of the message and syntax, it is usually the first program taught to beginners.
A syntax error represents some mistake in your code. Most languages — Java, Python, Ruby, etc. The Client Side vs.
Ive tried many.