Is there a discrepancy between screen width and element width when inspecting an element?

While resizing a page and using the inspect element tool, I noticed an interesting discrepancy. When my screen is at 599px wide (as shown in the top right corner of the page), an image that extends to the full width of the screen appears to be only 580px wide.

What could explain this difference of 19 pixels? Which width measurement is accurate? My assumption would be that the width displayed in the top right corner is correct because my css breakpoints are triggered with even just a 1px increase. However, this inconsistency has left me puzzled.

htmlcsswidthinspect

Answer №1

The value is 19 pixels shorter due to the presence of a scrollbar on the right side. Devtools provides the overall dimensions of the page, but when you select an element, it only shows that specific element's dimensions. The width calculation automatically includes the scrollbar in its own measurement.

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