Order of supported property names is not defined. See HTMLCollection in DOM
for how this probably should be done.
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This is also true for HTMLOptionsCollection and to some extent true for HTMLPropertiesCollection (could use "tree order").
Checked in as WHATWG revision r7722.
Check-in comment: Try to define order for supported property names. This is not based on testing. If there are compatibility constraints here that prevent implementing this as specced, please let me know.