What happens if the DOCTYPE declaration is omitted from an HTML document?
- Browsers might display the document in quirks mode.
- External styles will not be applied.
- The document will default to the latest HTML version.
- The document will not be rendered.
If the DOCTYPE declaration is omitted, browsers might default to "quirks mode" instead of "standards mode." Quirks mode can cause inconsistencies in how different browsers display the page because it mimics behavior from older browsers for backward compatibility. Including the appropriate DOCTYPE helps in rendering the page consistently across different browsers.
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