While analyzing the performance of a JSF 2.1 + PrimeFaces 4.0 webapp with Google PageSpeed, it recommends among others to defer parsing of JavaScript files. On a test page with a <p:layout> and a form with <p:watermark> and <p:fileUplo...
Google recommends scripts should be "deferred", but they do not mention the defer attribute of the <script> tag. I wonder why they don't even mention it, considering it has been around a while.  Instead they suggest injecting script...
How do I set the load and execution order of two external async Javascript files?  Given the following...  <script src="framework.js" async></script> // Larger file <script src="scripts.js" async></script> // S...
I need to run script only when DOM is ready as script does some rewriting of certain attributes of certain tags.  Currently I use document.addEventListener on DOMContentLoaded or if not available document.attachEvent  on onreadystatechange and if bot...
Once upon a time, there were many heated debate on <script> in <head> or <body>.  Many SO posts had already pointed out the best practice / rule of thumb is to place the <script> before end of <body>for not blocking the...
It's age-old common sense to start manipulating the DOM only once it's ready and we can be certain all the elements are available, and in the post-jQuery days we're all using the DOMContentLoaded event for this.  Now web components (espec...
I use google code to defer loading javascript (google pages)  But I have some inline javascripts such as:  <script type="text/javascript"> $(function () {     alert("please work"); }); </script>   And this gives me:     Un...
I am trying to understand defer with a simple example. I have the below JS code which takes 5 seconds to run.  home.js  function wait(ms){     var start = new Date().getTime();     var end = start;     while(end < start + ms) {       end = new Dat...
I am Improving website score on Google Pagespeed Insights.  There was a recommendation to defer CSS load for (Eliminate render-blocking JavaScript and CSS in above-the-fold content) So I tried  solution given on : Optimize CSS Delivery As I did so, M...
I have a site where the content is pulled into the page via a JavaScript widget which is deferred, to make it non-blocking and to ensure the dependency scripts in the footer are loaded before the widget:  <script defer src="//my-server.com/my-...

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