Icon without a visible label

This is not the same problem as E-34. An aria-label serves a screen reader and does nothing for a sighted user with low computer literacy, or anyone meeting an unfamiliar glyph. Both are required. Icon-only is acceptable for a small set of near-universal glyphs and in operator, where repetition builds recognition — and even there, on first-run surfaces the label stays. Close, search and menu are examples, not the whole list: the test is whether most readers would name the glyph the same way without the label. A sun and moon for the theme, or a service's own widely known mark linking to it, usually pass; a funnel, a sparkle or a lightning bolt does not. An icon-only control still carries its name in text a screen reader reads (E-34).