Best SEO Checklist
ONE FOCUSED ACTION

Reduce Cumulative Layout Shift (CLS) score below 0.1.

Core Web Vitals optimization

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    Why this matters

    CLS measures unexpected page layout shifts that disturb users during loading or interaction.

    A STARTING-POINT EXAMPLE

    Hypothetical standard operating procedure

    Adapt this example to your site, access, tools, and change process. It is our suggested procedure, informed by the sources below.

    1. Review CLS values in Core Web Vitals report for groupings of URLs.
    2. Use Chrome dev tools or Lighthouse to observe shifting elements visually.
    3. Pin dimensions on images and iframes to prevent shifts.
    4. Avoid inserting content dynamically above existing visible content.
    5. Reassess CLS after implementing layout stability fixes.

    Watch for

    High CLS indicates poor visual stability, causing user frustration and perceived unreliability.

    Definition of done

    Page CLS score is consistently below 0.1 ensuring stable layout.

    Sources & attribution

    1. Understanding Core Web Vitals and Google search results ↗

    Original checklist wording and example SOP by Best SEO Checklist, using source-grounded AI assistance. Editorial contact: Ted Kubaitis, @tedkubaitis on Teams. Check current source guidance before implementation.