[whatwg] Should :default apply to checkboxes, radios, and options?

Tab Atkins Jr. jackalmage at gmail.com
Fri Apr 30 13:05:07 PDT 2010

On Fri, Apr 30, 2010 at 12:12 PM, L. David Baron <dbaron at dbaron.org> wrote:
> For a long time, Gecko has implemented the behavior that the
> :default pseudo-class matches checkboxes, radios, and options that
> are selected by default (i.e., anything that matches :checked by
> default).  I think supporting it for option elements is explicitly
> stated in the spec where :default was introduced:
>  # One example is the default submit button among a set of buttons.
>  # Another example is the default option from a popup menu.
>  # Multiple elements in a select-many group could have multiple
>  # :default elements, like a selection of pizza toppings for
>  # example.
>    -- http://www.w3.org/TR/css3-ui/#pseudo-default
> and I think supporting it for radios and checkboxes logically
> follows from that.
> However, the HTML5 spec says that :default should not apply in these
> cases:
> http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#selector-default
> I don't feel particularly strongly about this one, but it seems like
> the original intent of :default was to match both things that are
> the "default button" and things that are "selected by default".
> Was this difference with existing implementation behavior
> intentional?

By "selected by default", do you mean things that had @checked or
@selected on page load?


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