| http://www.w3.org/ns/prov#value | - One thing to bear in mind is that even though these will not affect SEO they might affect CTR, e.g. if you have a <br \> within an <h1> or <h2> and Google decides to take this as your page title instead of the one you provide, Google users will only see the text before the <br \> in the SERPS page title.
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