Find all needed information about Script Defer Support. Below you can see links where you can find everything you want to know about Script Defer Support.
https://www.w3schools.com/tags/att_script_defer.asp
If neither async or defer is present: The script is fetched and executed immediately, before the browser continues parsing the page Browser Support The numbers in the table specify the first browser version that fully supports the attribute.
https://flaviocopes.com/javascript-async-defer/
Mar 24, 2018 · if you specify both, async takes precedence on modern browsers, while older browsers that support defer but not async will fallback to defer. For the support table, ... when they become available. Scripts marked defer are executed (after parsing completes) in the order which they are defined in the markup. Just tell me the best way.
https://javascript.info/script-async-defer
DOMContentLoaded waits for the deferred script. It only triggers when the script (2) is downloaded and executed. Deferred scripts keep their relative order, just like regular scripts. So, if we have a long script first, and then a smaller one, then the latter one waits.
https://html.com/attributes/script-defer/
HTML / <script> HTML Tag / <script defer> <script defer> In HTML Attributes. Disclosure: Your support helps keep the site running! We earn a referral fee for some of the services we recommend on this page. Learn more. Sharing is caring! 0 shares. Attribute of <script> HTML Tag.
https://www.growingwiththeweb.com/2014/02/async-vs-defer-attributes.html
If the script is modular and does not rely on any scripts then use async. 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
https://www.w3schools.com/jsref/prop_script_defer.asp
The defer property sets or returns whether a script should be executed when a page has finished parsing, or not. This property reflects the defer attribute of the <script> tag. Note: The defer attribute is only for external scripts (and should only be used if the src attribute is present).
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://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 the default blocking behavior.
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