*Summary:* Add a pseudo-element to file inputs in order to expose the
internal "Browse" button.
Since there's no spec yet, and the name might change, I plan to /not/
ship it just yet, and keep it Nightly / Dev Edition only for now until
the dust settles.
*Bug:* bug 1635675 <https://bugzil.la/1635675>.
*Standard:* None yet, this was just resolved
<https://github.com/w3c/csswg-drafts/issues/5049> by the CSS Working Group.
*Platform coverage:* All platforms.
*Preference:* layout.css.file-chooser-button.enabled
*Devtools Bug:* N/A
*Other Browsers:*
* WebKit and Blink ship a prefixed version of this called
::-webkit-file-upload-button.
* EdgeHTML shipped a prefixed version of this called ::-ms-browse.
*web-platform-tests:* I'm adding some very basic tentative tests in the
patch.
*Secure contexts:* Not restricted to secure contexts as many other CSS
selectors.
*Is this feature enabled by default in sandboxed iframes?* Yes
-- Emilio
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