The viewport is the area of a web page that is visible to the user and provides the information to the user for his use. This area varies according to the size of the device, like desktop, laptop, ...

css-env section 2 defines several viewport geometry environment variables. These make sense when used in the the top frame, but I think we should specify when or how these are propagated to sub frames ...

Issue: Some content, such as "Ln 16 Col 1," "Spaces: 2," "UTF-8," and "LF," disappears when the page is viewed at a 320 CSS pixel width, making it inaccessible to users with low vision who need to ...