These were bundled in with the truly dynamic, interaction-only
pseudo-classes (:hover/:active/:focus) and always resolved to false.
That's right for :hover et al (there's no live cursor against a static
snapshot) but wrong for :enabled/:disabled/:checked: those reflect
real, static DOM state (the disabled/checked attributes), not user
interaction, and modern component systems (Codex, Material, Bootstrap)
lean on :enabled constantly for their base button/input styling. With
it always false, every such base rule was silently inert, which is why
the Wikipedia TOC toggle button (a <button> with no disabled
attribute, so :enabled should be true) kept its default black border
instead of the transparent one its :enabled.cdx-button--weight-quiet
rule sets.
:enabled now matches a form control (input/button/select/textarea/
optgroup/option/fieldset) without a disabled attribute, :disabled the
opposite, and :checked matches the checked/selected attribute.
SGavrl
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