How to fill out this simple html form that place on the Google site page

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ID’s must be equal to id attribute in HTML. If your HTML contains:

<input id="user">

Which means you need to use same ID in script:

document.getElementById('user').value = "my value";

Make sure the input IDs is not overridden by any other element. If you’re not sure what ID an input is using, you can “Inspect Element” on your browser.

resim
resim797×321 14 KB

Also, I recommend executing the JavaScript after loading the page.