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What's the meaning of faint text in the Firefox dev tools inspector?

What does it mean when there is "faint text" in the Firefox dev tools inspector, like the .tab-pane divs in the .project_tab_content area:

enter image description here

This corresponds to some Bootstrap stuff that is working everywhere except Firefox, so I'm a little suspicious... Thanks!

Solution

  • Faded elements mean they are not visible. This can be due to some CSS like display: none or their dimensions being 0x0. See also the hint at MDN regarding this.