Get HTML Tags before the document.ready(), before DOM rendering

Question

I am looking for such a method which allows me to add, remove DOM objects of a page before the DOM has even rendered, I mean the first JS that i include in the head tag of my page can come up, look for a specific tag say and remove it from the HTML even before it is rendered, I know that the javascript call is blocking so as the browser will be rendering my page and will come to my javascript in head it will block the rendering and download and excecute the javascript, now at the moment of execution i need control of the previously downloaded HTML waiting to be rendered. Is there any such way?

I have tried using document properties but the i dont get the tags in my js which come after this js in the html.

Answer 1

Insert the JavaScript just before </body>.

Answer 2

You've got to be careful with this, as trying to modify the DOM before it has been completed causes problems in IE. Particularly in IE6 this would cause a very unfriendly error message, which after accepting causes the standard "This Page cannot be displayed" page. Although not completely recitified in IE8, this problem is simply swallowed.

If its possible, I would recommend stripping the required tags out of the html before it gets to the renderer, either through a proxy, or a browser extension. If these are not really feasable, then I'm not sure what you can do.

Answer 3

Perhaps another way of attacking the problem is from the other direction. Start with everything hidden, then only show the elements you want once the page is loaded. Not sure if your problem domain allows for that, but it might work for you.

Answer 4

So, you want to prevent a script in the page from executing? If you can put your own script where-ever you want, you could try

<script>
document.write("<!--");
</script>
<script>// offending script</script>
<script>
document.write("-->");
</script>

(Warning: that way lies madness.)

Answer 5

A short and simple answer to this question is NO, this cant be done