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The spec says about CSSKeyframesRule.deleteRule(): ...deletes the CSSKeyframeRule with the passed key. But the spec explicitely allows multiple keyframe rules for same key, saying that in that case the last one specified wins. Then I assume only the last one specified for a given key is preserved in the OM. This should be clarified.
Likewise, which rule is returned by findRule()?
WG resolution, 2014-10-22: we describe current implementation behavior i.e. both methods apply to the last rule specified with the key passed to them.