Searching for Script Tag Defer Support information? Find all needed info by using official links provided below.
https://www.w3schools.com/tags/att_script_defer.asp
The defer attribute is a boolean attribute. When present, it specifies that the script is executed when the page has finished parsing. Note: The defer attribute is only for external scripts (should only be used if the src attribute is present). Note: There are several ways an external script can be executed:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script
Compatibility notes. In older browsers that don't support the async attribute, parser-inserted scripts block the parser; script-inserted scripts execute asynchronously in IE and WebKit, but synchronously in Opera and pre-4 Firefox. In Firefox 4, the async DOM property defaults to true for script-created scripts, so the default behaviour matches the behaviour of IE and WebKit.
https://flaviocopes.com/javascript-async-defer/
Mar 24, 2018 · Here’s how a page loads a script with async, put in the head tag: The script is fetched asynchronously, and when it’s ready the HTML parsing is paused to execute the script, then it’s resumed. With defer, in the head. Here’s how a page loads a script with defer, put in the head tag:
https://davidwalsh.name/script-defer
Jul 16, 2010 · One of the seldom used attributes within the HTML tag library is the defer attribute on SCRIPT elements. As you can probably tell by the name of the attribute, defer instructs the contents of the script tag to not execute until the page has loaded. Take a look! Deferring Your Scripts
https://html.com/attributes/script-defer/
The defer element of <script> allows a script to load, but pauses the execution of the script until the page has loaded. Claire Broadley Claire is seasoned technical writer, editor, and HTML enthusiast.
https://www.keycdn.com/support/prefer-async-resources
Oct 04, 2018 · Support. Find answers, guides, and tutorials to supercharge your content delivery. Getting Started; ... HTML parsing is paused when it encounters a <script> tag which loads synchronously; A request is made to fetch the file (if external) ... in this case you should use defer.
https://www.growingwiththeweb.com/2014/02/async-vs-defer-attributes.html
If the script relies upon or is relied upon by another script then use defer. If the script is small and is relied upon by an async script then use an inline script with no attributes placed above the async scripts. Support. IE9 and below have some pretty bad bugs in their implementation of defer such that
https://developer.mozilla.org/en-US/docs/Web/API/HTMLScriptElement
If neither attribute is present, then the script is fetched and executed immediately, blocking further parsing of the page. The defer attribute may be specified with the async attribute, so legacy browsers that only support defer (and not async) fall back to the defer behavior instead of …
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