[BUG] user-select needs prefixes

[slavanga]

The example for disable selection currently only works in Blink-based browsers.
Other browsers still need vendor prefixes for the user-select property:

-webkit-user-select: none;
   -moz-user-select: none;
    -ms-user-select: none;
        user-select: none;

[atomiks]

Generally prefixes are avoided because of commonly-used tools like autoprefixer. Notes are added on browser support:

⚠️ Requires prefixes for full support

[lock]

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