Sigh, I got the expected result with raw DOM test cases. So, this could be caused by that Gecko runs a UA specific path in Outlook and Gmail. * https://jsfiddle.net/d_toybox/xwa91u4j/1/ * https://jsfiddle.net/d_toybox/xwa91u4j/2/
Bug 1778091 Comment 5 Edit History
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Sigh, I got the expected result with raw DOM test cases. So, this could be caused by that Gecko runs a UA specific path in Outlook and Yahoo! Mail. * https://jsfiddle.net/d_toybox/xwa91u4j/1/ * https://jsfiddle.net/d_toybox/xwa91u4j/2/