Rulers
You can overlay horizontal and vertical rulers on a web page:
![../../_images/viewport_rulers.png](../../_images/viewport_rulers.png)
The units are in pixels.
The dimensions of the viewport are displayed near the top-right corner of the viewport.
To be able to toggle rulers for a page, you first need to enable the button by going to the settings page for the Developer Tools and checking “Toggle rulers for the page” under Available Toolbox Buttons.
![../../_images/settings_available_buttons.png](../../_images/settings_available_buttons.png)
Once enabled, the “Toggle rulers for the page” button appears at the top right of the Toolbox, in the same place as the Settings/Options button.
![../../_images/ruler_toggle_button.png](../../_images/ruler_toggle_button.png)
Behavior to keep in mind when using rulers:
The rulers command must be reapplied in new tabs and after each page refresh.
The command isn’t permanent.