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monospace font do not work in some webpage

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  • Last reply by MarkRH

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when i browse this page https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox ,the monospace font show error, the detial please check fellow images. picture 2 is my font settings

when i browse this page https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox ,the monospace font show error, the detial please check fellow images. picture 2 is my font settings
Attached screenshots

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It's working like it should as best I can tell. The CSS is defining the font as Monospace which Firefox is using Consolas to show since a specific Monospace font was not specified.