Additional argument or filter for submit_button function

[wpidiots]

submit_button function should have an additional argument $class so we can add additional classes to the button or filter on $classes array in get_submit_button() function

I know that we can use $wrap as workaround but if I want to add, for instance, "right" class to the submit button I am not able to.

[SergeyBiryukov]

Additional classes can be added using the $type argument:

submit_button( 'Submit', 'primary right' );

No need for a new argument here: #20492.

[DrewAPicture]

docs

[DrewAPicture]

I think we can at least update the phpdoc for submit_button() to mention that the $type parameter doubles as the value of the class attribute.

27070.diff​ does this.

[DrewAPicture]

In 27135:

Clarify submit_button() $type parameter docs to mention that the value doubles as the CSS class attribute.

See #27070

[DrewAPicture]

In 27136:

Improve inline documentation for submit_button().

See #27070.

[DrewAPicture]

The docs fixes in [27135] and [27136] should cover it. Feel free to reopen if more clarification is required.

[DrewAPicture]

In 27137:

Fix docs spacing missed in [27136].

See #27070.