Luckily, there are two From a downloading and latency ... Both async and defer have one common thing: downloading of such scripts doesn’t block page rendering. CORS stands for Cross-Origin Resource Sharing. But preload and server push files don't instruct the browsers to apply the downloaded files so those files need . Found inside – Page 211In order to avoid this issue, we need to load scripts in the background with no impact on page rendering-we need asynchronous loading. HTML provides us with a couple of attributes of the □ Note there is a decision for you to make ... Modern browsers also support async and defer attributes in the script tag itself. the async attribute makes the ... It must execute the script right now. In order to draw the graphics, you are supposed to use a script. charset: Defines the character encoding that the script uses. This will cause issues and will likely end in your script NOT being imported at all. "If everyone would implement just 20% of Steve's guidelines, the Web would be adramatically better place. Between this book and Steve's YSlow extension, there's reallyno excuse for having a sluggish web site anymore. Don't try to use the "short-cut" approach like this <script type="text/javascript" />. This applies to both inline scripts as well as those in external files. HTML 4.01 strict, HTML 4.01 transitional, HTML 4.01 frameset. The alt attribute allows visual content to be communicated in an alternative way when visual presentation isn't available for physical or technical reasons. Contact All Purpose Asphalt for more details. after the page has finished parsing. The purpose of the HTML defer attribute is to tell the user agent to defer the execution of a script. The async attribute means that a script is completely independent: In other words, async scripts load in the background and run when ready. Whatever loads first (probably small.js) – runs first: Async scripts are great when we integrate an independent third-party script into the page: counters, ads and so on, as they don’t depend on our scripts, and our scripts shouldn’t wait for them: There’s one more important way of adding a script to the page. So the user can read page content and get acquainted with the page immediately. Found inside – Page 8To define JavaScript directly, include it in between the opening and closing tags like this: