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In order to add support for the SELECT and TABLE tags in the HTML Processor, it needs to implement the HTML algorithm named "reset the insertion mode appropriately". This patch implements that algorithm to unblock the additional tag support. The algorithm resets the parsing mode after specific state changes in complicated situations where alternative rules are in effect (such as rules governing how the parser handles tags found within a TABLE element). Developed in https://github.com/WordPress/wordpress-develop/pull/6020 Discussed in https://core.trac.wordpress.org/ticket/61549 Props dmsnell, jonsurrell. Fixes #61549. Built from https://develop.svn.wordpress.org/trunk@58656 git-svn-id: http://core.svn.wordpress.org/trunk@58070 1a063a9b-81f0-0310-95a4-ce76da25c4cd