I m making an extension for gmail and trying to add a side panel when the user opens his mail( The place where contact information of the sender is shown). I searched and only found out that i can modify the css only. By modifying the css i m able to make space for the panel. Its just empty space there. How can i insert a html page in that empty space??
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_"I searched and only found out that i can modify the css only"_ Well, search again. And look at [this documentation](https://developer.chrome.com/extensions/content_scripts) and [this question](http://stackoverflow.com/q/12783217/934239) while you're at it. – Xan Feb 19 '15 at 10:07
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You can use the Elements panel for a variety of tasks:
Inspect the HTML & CSS of a web page.
Test different layouts.
Live-edit CSS.
To make better use of screen real estate, you may find it convenient to follow these workspace tips:
Collapse any panes you are not actively using.
Resize the divider between the DOM tree and the sidebar containing the panes.
