Image captions and block level elements

[trepmal]

After accidentally putting a captioned image inside another image's caption (yo dawg), I found that block level elements in general seem to not play well.

[caption id="attachment_809" width="150" align="alignnone"]<a href="#"><img width="150" height="150" src="http://colorto.me/png/150/rand" class="size-thumbnail wp-image-809" /></a> tree<p>block level in caption</p>[/caption] 

With <p> tag: Toggling about 3 times completely removes the tag, contents remain

[caption id="attachment_809" width="150" align="alignnone"]<a href="#"><img width="150" height="150" src="http://colorto.me/png/150/rand" class="size-thumbnail wp-image-809" /></a> tree<div>block level in caption</div>[/caption] 

With <div> tag: Toggling about 2 times causes the entire caption to be removed, after first adding some unbalanced <dd> and <dl> after the first toggle

[caption id="attachment_809" width="150" align="alignnone"]<a href="#"><img width="150" height="150" src="http://colorto.me/png/150/rand" class="size-thumbnail wp-image-809" /></a> tree<ul><li>block level in caption</li></ul>[/caption] 

With <ul><li> tags: First toggle will 'organize' your list tags, each toggle after that adds 2 <br /> tags and wraps an extra <ul> around the list.

[trepmal]

If block levels tags aren't supported in captions, can it break consistently? Or with valid html?

[kirasong]

Chatted with @azaozz on this a bit in the chat log linked above.

Currently, we don't officially support block level elements in captions due to conflicts between MCE's cleanup, and browser quirks.

However, since users can unwittingly paste the text in as a caption within MCE's popup, it'd be good to at least make the experience consistent.

[ericlewis]

Replying to DH-Shredder:

Currently, we don't officially support block level elements in captions due to conflicts between MCE's cleanup, and browser quirks.

However, since users can unwittingly paste the text in as a caption within MCE's popup, it'd be good to at least make the experience consistent.

If we don't officially support block level elements in captions, should we strip them from the caption field on change? Or on "Insert into post" click?

[azaozz]

This behavior has changed which makes this ticket invalid now. If block elements are pasted in a caption they are removed and <br> inserted instead.