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What is HTML anyway? MDN's basics of HTML... MDN==Mozilla Developer Network
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Shay Howe's Learn to Code HTML & CSS. Written tutorial. Super informative and comprehensive. Not obnoxious. Lots of hours.
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Khanacademy's HTML/CSS: Making Webpages. Video and in-browser editor. Super informative, slightly obnoxious at points :) Approximately 3-6 hours.
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Code Academy's HTML/CSS Course. Interactive written tutorial. Fairly comprehensive. Approximately 5-7 hours.
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HTML and CSS: Design and Build Websites (Great book and resource)