[cssom] "The item(index) method must return the property..."

[domenic]

https://drafts.csswg.org/cssom/#the-cssstyledeclaration-interface

The item(index) method must return the property name of the CSS declaration at position index.

What happens if there is no CSS declaration at position index, e.g. if index is 1_000_000?

[cdoublev]

I guess "or return the empty string if there is no CSS declaration at position index" is implied, for consistentcy with getPropertyValue(), which returns empty string if there is no declaration for the given property.

[tabatkins]

"Empty string" is definitely the right answer, but we can't rely on implication. This is just a trivial spec bug, yeah.