Rulers

You can overlay horizontal and vertical rulers on a web page:

../../_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

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

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.