HTML / XML / JS, low-level validity (cross-cutting)HighInferred

Content before <head> / malformed start

Content or stray output before the head, or a malformed document start, can push the browser into quirks mode or misparse the page. The document should start cleanly with the DOCTYPE and head.

What it is

Markup before the head.

Why it matters

Browsers/Google may relocate elements, breaking head directives.

How to fix it

Start the document correctly.

How to find it on your site

  1. View the very start of the raw HTML for stray output before the DOCTYPE or head.
  2. Find the source, often a misplaced include or whitespace from the server.
  3. Remove anything before the DOCTYPE.
  4. Re-validate the document start.

Cross-reference to ranking and citation factors

A malformed start can trigger quirks mode and misparsing. A clean DOCTYPE-first start keeps rendering standard.

Impact

Medium-high. Inferred.

Evidence

Valid document structure protects head directives. Google Search Central, Robots Meta Tags Specifications

← Multiple head/body elementsMissing DOCTYPE →