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@Vadim_Klimets Titles may contain character entities (for accented characters, special characters, etc.), but may not contain other markup (including comments).
2017 May 18, 12:16:27 AM
2017 Apr 29, 8:17:58 AM
Fix this question!
<title>learn <sup>html</sup> at quizful</title> pass checking at https://validator.w3.org
<title></title> doesn't pass checking at https://validator.w3.org
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