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Squarespace fix guide

Missing or Invalid DOCTYPE Declaration on Squarespace

No <!DOCTYPE html> found. Without it, browsers render in quirks mode which causes inconsistent styling and layout.

Issue ID: TECH-DOCTYPE-001Severity: moderateEffort: S

Why this matters

No <!DOCTYPE html> found. Without it, browsers render in quirks mode which causes inconsistent styling and layout. This affects crawlability, rendering, and whether the site can be interpreted correctly by search engines.

Squarespace fix path

How to fix this on Squarespace

Check page settings, navigation, and code injection.

  1. 1Identify whether this is page-level or site-level.
  2. 2Apply the fix.
  3. 3Republish and confirm.

After you fix it

  • View page source and confirm <!DOCTYPE html> is the first line

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