28 lines
879 B
ReStructuredText
28 lines
879 B
ReStructuredText
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Rulers
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======
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You can overlay horizontal and vertical rulers on a web page:
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.. image:: viewport_rulers.png
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:class: center
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The units are in pixels.
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The dimensions of the viewport are displayed near the top-right corner of the viewport.
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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.
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.. image:: settings_available_buttons.png
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:class: center
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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.
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.. image:: ruler_toggle_button.png
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:class: center
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Behavior to keep in mind when using rulers:
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- The rulers command must be reapplied in **new tabs** and after **each page refresh.**
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- The command isn't permanent.
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