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+======
+Rulers
+======
+
+You can overlay horizontal and vertical rulers on a web page:
+
+.. image:: viewport_rulers.png
+ :class: center
+
+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.
+
+.. image:: settings_available_buttons.png
+ :class: center
+
+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.
+
+.. image:: ruler_toggle_button.png
+ :class: center
+
+
+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.