When you inject your content script, within the manifest you can state the "run_at" parameter to be "document_start", the files are injected after any files from css, but before any other DOM is constructed or any other script is run. More information can be found here.
{
"name": "My extension",
...
"content_scripts": [
{
"matches": ["http://www.google.com/*"],
"css": ["mystyles.css"],
"js": ["jquery.js", "myscript.js"],
"run_at": "document_start"
}
],
...
}
*Edited, added an example. One of the mutations event types could be used.
Example
manifest.json
{
"name": "Content Script test",
"version": "0.1",
"description": "Content Script test",
"content_scripts": [
{
"matches": ["http://*/*"],
"js": ["cs.js"],
"run_at": "document_start",
"all_frames": true
}
]
}cs.js
document.addEventListener('DOMSubtreeModified', OnSubtreeModified, false);
function OnSubtreeModified(event) {
console.log('Hello from extension!');
document.removeEventListener('DOMSubtreeModified', OnSubtreeModified, false);
}test.html (on the web somewhere)
<html>
<head>
<script>
alert('Hello from Web!');
</script>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>Results
You will two alerts, in the order:
- Hello from web!
- Hello from extension!
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