Page: DOMContentLoaded, load, beforeunload - So DOMContentLoaded definitely happens after such scripts: script > // the script doesn't not execute until the stylesheet is loaded alert . The difference is that window.onload always works after all other load handlers.
Page: DOMContentLoaded, load, beforeunload - DOMContentLoaded event – DOM is ready, so the handler can lookup across a <script> tag, it needs to execute before continuing building the DOM. The load event on the window object triggers when the whole page is
DOMContentLoaded vs jQuery.ready vs onload, How To Decide - jQuery.ready / DOMContentLoaded occurs when all of the HTML is ready to interact with, but often before its been rendered to the screen. The load event occurs when all of the HTML is loaded, and any subresources like images are loaded. Use setTimeout to allow the page to be rendered before your code runs.
HTML script async Attribute - Definition and Usage. The async attribute is a boolean attribute. When present, it specifies that the script will be executed asynchronously as soon as it is
Scripts: async, defer - In modern websites, scripts are often “heavier” than HTML: their download size is larger, and processing time is also longer. When the browser
Script Tag - async & defer - Keep your scripts right before </body> . Async can be used with scripts located there in a few circumstances (see discussion below).
Async Attribute and Scripts At The Bottom - A reader recently wrote in and (essentially) asked me: Is there any reason to use the async attribute when the script is already at the bottom of
async vs defer attributes - The async and defer attributes for the <script> element have great support The HTML file will be parsed until the script file is hit, at that point
Synchronous and asynchronous snippet loading - A/B testing scripts can be loaded in two ways: Synchronously, where scripts are loaded sequentially, one after another, starting with the <head>