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The logo link may become invisible mystery navigation when a user enforces their color scheme. Example method to reproduce in Mac Fx: * Open Preferences * Go to Content tab. * Click Colors button * Untick "Allow pages to choose their own colors" * Visit e.g. docs.webplatform.org This is a not uncommon problem with CSS text replacement and may cause accessibility problems for users who need different colors for legibility, but don't need to throw out the entire site layout. Cleanest approaches still seem to be inline SVG, sniffing for author color application with JS before replacing the text with CSS background image, or just using an img with alt old-style. When I was reporting this bug it was pointed out to me that the link is actually missing any link _text_: <div id="p-logo"><a href="/wiki/Main_Page" title="Visit the main page"></a></div>