HTML Fundamentals

<!DOCTYPE html>

The document type declaration that tells browsers to render in HTML5 mode.

1Why DOCTYPE Matters

The <!DOCTYPE html> declaration must be the very first line of every HTML document. It puts the browser in standards mode so your CSS and layout behave predictably.

Example Code

<!DOCTYPE html>
<html lang="en">
  <head><title>OK</title></head>
  <body>...</body>
</html>

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