Uploaded October 2019 | Updated September 2026, 2 weeks ago

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Have ever set a width in CSS, and… nothing happens? It happened to me again, right after I filmed this video. There are a number of property & value combinations that can lead to CSS being inactive, and now Firefox will tell you why. Open the developer tools, and look for the greyed-out property with an info-box on hover.

#firefoxdevtools #css #miriamsuzanne