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Step 1
As you've seen in the previous projects, webpages should start with a `DOCTYPE html` declaration, followed by an `html` element.
Add a `DOCTYPE html` declaration at the top of the document, and an `html` element after that. Give the `html` element a `lang` attribute with `en` as its value.
Vượt qua bài kiểm tra hiện tại để mở khóa bài tiếp theo.
main.html
UTF-8 • Tab Size: 2Kiểm tra bài:⌘↵