JavaScript Title Rewrites: 12.6% of Top 1M Homepages

    95,312 of 756,882 top-1M homepages with a rendered title (12.6%) show a different title after JavaScript runs than in the HTML the server sends.

    Share of homepages whose title changes after JavaScript, by popularity tier
    Top 1K (737)11.3%
    Top 10K (6,518)10.1%
    Top 100K (64,687)12.9%
    Top 1M (684,940)12.6%

    Source: PageSpeed Matters. HTTP Archive crawl, Sept 2026, mobile, top 1M sites by Chrome traffic.

    Tiers are separate rank bands (Top 10K means ranks 1K to 10K). Some rewrites are harmless, such as counters.

    Source: JavaScript Title Rewrites: 12.6% of Top 1M Homepages - PageSpeed Matters