As per this Mozilla bug, there are already vendor-specific selectors to style buttons rendered within <input type=file> controls for Webkit and Trident engines. Webkit alone represents the majority market share, EdgeHTML is now "legacy", leaving Gecko/Quantum as the only current major engine without it. Mozilla is reluctant to add their own vendor-prefixed selector when the sensible choice would be to make ::file-upload-button official.
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.3