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...
I wanted to know what is the most recommended way in terms of optimization, caching and page load speed. Should I dynamically insert the JS files in the BODY or HEAD of my website document when using Defer loading?...
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...
Google Page Speed Insights     "Try to defer or asynchronously load blocking resources, or inline the   critical portions of those resources directly in the HTML."   The above issue is prompting me for my 2 stylesheets. So I load my styleshee...
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 am displaying a Norton Secure Site Seal in a website and I would like to improve the page speed deferring the loading of the seal script. All the tries I've done failed and I found only this page where this is mentioned (link). Has anyone ever...
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...

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