https://teamtreehouse.com/community/i-wrote-html-code-html-html-under-the-doctype-and-my-answer-is-wrong-why
abdulkarem osman is having issues with: html code writing problem index.htm...
html codewrotedoctype
https://pastebin.com/TqKGk8T4
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html langmeta charsetdoctypeenhead
https://www.w3schools.com/tags/tag_doctype.asp
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
html doctypedeclaration