Screen Ruler: Measure The Web

Screen Ruler is the perfect companion for web developers and designers wanting to validate the implementation of their websites. Once activated, Screen Ruler allows you to view the sizes, margins, paddings, tag names, IDs, and classes simply by hovering over any element. You can also select an element to measure distances to other elements.

Usage

• Toggle Screen Ruler by clicking the extension icon, selecting “Screen Ruler” from the right-click context menu, or using the shortcut Alt/Option + Shift + R.
• Hover over elements on web pages to display their sizes, margins, paddings, tag names, IDs, and classes.
• Select an element by clicking on it directly, this will turn the highlight red. To deselect, click again, press Escape or select a different element.
• To select the parent of an element, use Alt/Option + Up, moving your selection to the parent element instead, use Alt/Option + Down to reverse your selection.
• Open the side panel to view the computed CSS of the currently selected element. Click the "Copy CSS" button to copy the computed CSS of the currently selected item to your clipboard.

Features

• Measure the pixel size of any element.
• Measure the pixel distance between any two elements.
• HTML tag names, class names and IDs.