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Why can you only use defer when src is specified?

原文 2011-03-16 12:45:09 1 2 javascript/ html

When validating code that uses the <script> tag I get the following warning on validator.w3.org

Element script must not have attribute defer unless attribute src is also specified.

I don't understand the need for this, could someone explain it?

2 answers

The point of defer is to say "You can keep on parsing the HTML before waiting for the script to arrive".

If the script is right there in the HTML, then you can't (since the script is in the way in the source code) and it would be pointless (since there is no external dependancy that would block parsing).

Defer attribute means asyncronous script loading (by default scripts are loaded by browser in first turn, and are executed immedialtely after loading completed).

Without src property there will be nothing to load, and nothing to defer.

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Related Question Node.js Q promises, why use defer() when you can use this()? Can you use both the async and defer attributes on a HTML script tag? when NOT to use defer attribute Why can you only use expressions in JSX, not statements? Can you use <c:otherwise> with <c:if> or only with <c:when>? Why use defer with Google Maps Javascript? Why use matchMedia when you can just check if an element is visible? when to use $q.defer() in Angularjs Can I use <script defer> safely now? Can i use defer attribute in inline js?

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Why can you only use defer when src is specified?

Question

2 answers

solution1
13 ACCPTED 2011-03-16 12:48:19

solution2
2 2011-03-16 12:48:24

Why can you only use defer when src is specified?

Question

2 answers

solution1 13 ACCPTED 2011-03-16 12:48:19

solution2 2 2011-03-16 12:48:24

solution1
13 ACCPTED 2011-03-16 12:48:19

solution2
2 2011-03-16 12:48:24