The **menucaption** binding is doable without all the **<children>** maneuver when **menu-base** and **menuitem-base** are implemented.
raw note:
> **menucaption**
> This is only used for <optgroup>s on select: https://searchfox.org/mozilla-central/rev/b4ebbe90ae4d0468fe6232bb4ce90699738c8125/toolkit/modules/SelectParentHelper.jsm#340
Should actually be doable now, since all parent bindings just use inherits, properties, methods
Bug 1519502 Comment 2 Edit History
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The **menucaption** binding is doable without all the `<children>` maneuver when **menu-base** and **menuitem-base** are implemented.
raw note:
> **menucaption**
> This is only used for <optgroup>s on select: https://searchfox.org/mozilla-central/rev/b4ebbe90ae4d0468fe6232bb4ce90699738c8125/toolkit/modules/SelectParentHelper.jsm#340
Should actually be doable now, since all parent bindings just use inherits, properties, methods