I have a script that I want to be injected into the document BEFORE load. I.E; it should function as if

```
<script..>MYSCRIPT HERE</script>

<html>
.
.

```

I have made a script in chrome that executes correctly (I can alert(0) etc) but, it runs in different environment which is not what I want. I want it to run in the SAME environment as page.

Earlier, I had used a trick where in the startup script I had used 

```
window.location="javascript:<MY SCRIPT HERE>"

```

which effectively changes the execution environment but for the past few days it isn't working. I think its a chrome bug fix. Is there any other workaround for this? Note: I can't add script tags dynamically to the page in the startup script because the document.body etc are unavailable.

I would like to provide you more details of why I need this and my previous solution.
HTML Page which I don't have control over:

```
.
.
<script>
function a(){//DOSOMETHING}
</script>
.
.
<script>
a(); <<------ I DONT WANT TO CALL THIS
</script>

```

Solution: startup JavaScript contains

```
window.location='javascript:const a=function(){};';<<-CONST used!!

```

That will force error of re-declaration of 'a' when the page actually loads, hence, when a() is called, nothing happens. (clever, right? -\_-)

But now, I realized when I do `window.location="js:.."`, even that runs in separate env!