When validating code that uses the <script> tag I get the following warning on validator.w3
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?
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?
Share Improve this question edited Mar 16, 2011 at 12:47 Jakub Hampl 40.5k10 gold badges79 silver badges111 bronze badges asked Mar 16, 2011 at 12:45 TobyToby 8,79213 gold badges48 silver badges70 bronze badges2 Answers
Reset to default 17The 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.