On 05/23/2016 10:17 PM, Boris Zbarsky wrote:
Summary: The "form" content attribute on <label> elements no longer means 
anything.  .form returns the .form of the labeled control, or null if
nothing is labeled or the labeled thing has no .form.  In particular, you can 
no longer associate a label with one form but associate its labeled
control with a different form.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1268852

Spec: https://github.com/whatwg/html/pull/1120 and 
https://html.spec.whatwg.org/multipage/forms.html#the-label-element and
https://html.spec.whatwg.org/multipage/forms.html#dom-label-form

Estimated release: 49

devtools bug: none needed, I think.

Support in other browsers: Chrome is planning to do this.  See 
<https://groups.google.com/a/chromium.org/d/msg/blink-dev/QWyCpJjgfY8/TOxG9n-OAQAJ>.
  According to that message, Edge and WebKit don't support the "form" content 
attribute on <label> anyway; .form always returns the ancestor form in
those engines.

-Boris


As I said in https://github.com/whatwg/html/issues/787 this change looks ok to 
me.


-Olli
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