PASS The HTMLModelElement interface has a currentSrc property.
PASS The currentSrc property is read-only.
PASS The currentSrc property is the empty string when no <source> is provided.
PASS The currentSrc property is the empty string when a <source> is provided with no src attribute.
PASS The currentSrc property is the empty string when a <source> is provided.
PASS Changing the src attribute of a <source> changes the currentSrc property.
PASS Removing the <source> changes the currentSrc property.
PASS currentSrc returns the src value for the first <source> element.
PASS Removing a <source> element updates currentSrc.
PASS Adding a <source> before the current <source> updates currentSrc.