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fix(compiler-vapor): keep end tags inside and around form elements - #15693
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edison1105 merged 1 commit intoSep 28, 2026
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`</form>` goes through the form element pointer and removes only the form element itself, so an element inside a form whose end tag is emitted has to close itself. `form` is added to ALWAYS_CLOSE_TAGS so a form off the rightmost path keeps its end tag and resets the pointer for the next form. fix vuejs#15691
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A Vapor template that puts an element inside a
<form>renders the wrong tree. For<section><form><div>x</div></form><p>y</p></section>the compiler emits<section><form><div>x</form><p>y, and the parser puts the<p>inside the form's<div>instead ofafter the form. In
<div><form>...</form></div><div><form>...</form></div>the second<form>start tag isdropped while its children stay. When a binding follows the form, the render function takes
next(form),gets
nulland mounting throwsCannot read properties of null (reading 'firstChild'). Onlyclient-created trees are affected. Hydration adopts the server DOM and parses no template string.
template()builds the DOM from an HTML string, where shipping parsers routeformthrough the formelement pointer:
</form>removes the form element alone rather than popping up to it, so a descendantwhose end tag was omitted stays open and adopts the form's next sibling; and a form closed by its parent's
end tag leaves the pointer set, which makes the parser ignore the next
<form>start tag.canOmitEndTagin
transforms/transformElement.tsaccounted for neither, so it dropped the end tag of the form's lastchild. This adds
formtoALWAYS_CLOSE_TAGSinshared/src/domTagConfig.tsso a form off the rightmostpath keeps its end tag and resets the pointer, and makes
canOmitEndTagkeep the end tag of every elementinside a form whose end tag is emitted. A form on the rightmost path still omits as before; the cost is a
few extra end tags inside forms that are not. The fix is correct under both the old parse rule and
whatwg/html#12911.
This is the mechanism of #14336, which 3d550db (#14337) fixed only for a
<button>as the form's lastchild; #15657 covers the same class for foreign content. Fix proposed by @denismrte in #15691.
fix #15691