All h3 tags in a metabox look like a handle

[nabil_kadimi]

When playing with metaboxes, I noticed that every h3 inside every metabox get this CSS applied to it:

.js .postbox h3 {
    cursor: move;
}

I believe only the first h3 child of .postbox would need that CSS, so a selector like this one would be more suited:

.js .postbox > h3 {
    ...

[SergeyBiryukov]

Looks like this needs some more adjustments, see 28485.2.patch​.

We also use .hndle class in some places (example​). Perhaps we should use it in other instances too.

[helen]

In 28940:

Only apply metabox handle styles and JS events to .postbox .hndle, as opposed to all h3s in a .postbox.

Developers previously relying on the h3 behavior may be affected. You may want to investigate do_meta_boxes() rather than recreating markup.

props SergeyBiryukov, nabil_kadimi.
fixes #28485.