B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
42%
42% -- unindexed javascript content share for JavaScript-heavy websites (2026)
A rendering gap leaves 42% of JavaScript content unindexed.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
42%
Unit
Percentage
Data Vintage
2026
Entity
Geography
Global
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
EdgeComet
Primary
Tier C
https://edgecomet.com/for-seo/ ↗
Source Article
EdgeComet for SEO Teams: Control Crawling, Indexing, and Visibility
Merchant feed pre-caching and validation in EdgeComet
EdgeComet now reads your Google Merchant feed. Every fetch compares the feed with its previous version, re-caches the product pages...
Read ArticleGet discovered in AI results.
Make your site easier for search engines and AI crawlers to access, u…
Original Research
EdgeComet
· Original study ↗
Methodology
Vendor-cited figure; original study not identified
Methodology documented
Segmentation
IndustryMedia
RegionGlobal
RoleSEO Specialist
Channelsearch
Cite this stat
Plain Text
JavaScript-heavy websites: 42% unindexed javascript content share. Source: EdgeComet (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/js-content-unindexed
HTML Embed
<blockquote cite="https://lighthousedata.io/data/js-content-unindexed" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>42%</strong> -- unindexed javascript content share for JavaScript-heavy websites<br><small>Source: EdgeComet (2026) · <a href="https://lighthousedata.io/data/js-content-unindexed" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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