2.1.117 [HTML5:2014] Section 6.1.5.1 Event handlers

V0271: The form owner is not taken into account in events

The specification states:

 ... Event handlers
     ...
     When the user agent is to get the current value of the event handler H, it must run 
     these steps:
         1. If H's value is an internal raw uncompiled handler, run these substeps:
            ...
            5.  If element is not null and element has a form owner, let form owner be 
                that form owner. Otherwise, let form owner be null.

All document modes (All versions)

The form owner is not taken into account in events.

V0269: Removing an event content attribute does not remove the content attribute specified value from the event

The specification states:

 6.1.5.1 Event handlers
     ...
     When an event handler content attribute is removed, the user agent must set the 
     corresponding event handler to null.

IE11 Mode (All versions)

Removing an event content attribute does not remove the content attribute specified value from the event.

V0268: The body.onload event does not overwrite the window.onload event

The specification states:

 ... Event handlers
     ...
     If an event handler IDL attribute exposes an event handler of an object that doesn't 
     exist, it must always return null on getting and must do nothing on setting.

All document modes (All versions)

The body.onload event does not overwrite the window.onload event.