https://www.screamingfrog.co.uk/blog/bing-javascript/
Is Bing Really Rendering & Indexing JavaScript? - Screaming Frog
Mar 12, 2025 - Historically all search engines were fairly blind to content created dynamically using JavaScript and would only crawl and index content within the initial...
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https://www.screamingfrog.co.uk/seo-spider/issues/javascript/canonical-only-in-rendered-html/
Issues - JavaScript : Canonical Only in Rendered HTML | Screaming Frog
Sep 11, 2024 - Pages that contain a canonical only in the rendered HTML after JavaScript execution. Google can process canonicals in the rendered HTML, however they do not...
issues javascript canonical
https://www.screamingfrog.co.uk/seo-spider/issues/pagespeed/avoid-serving-legacy-javascript-to-modern-browsers/
Issues - PageSpeed : Legacy JavaScript | Screaming Frog
Oct 14, 2025 - Pages with legacy JavaScript. Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren’t necessary for modern...
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https://www.screamingfrog.co.uk/seo-spider/issues/javascript/h1-updated-by-javascript/
Issues - JavaScript : H1 Updated by JavaScript | Screaming Frog
Feb 27, 2024 - Pages that have h1s that are modified by JavaScript. This means the h1 in the raw HTML is different to the h1 in the rendered HTML.
issues javascriptupdatedfrog
https://www.screamingfrog.co.uk/seo-spider/issues/response-codes/internal-redirection-javascript/
Issues - Response Codes : Internal Redirection (JavaScript) | Screaming Frog
Feb 23, 2024 - Internal URLs with a JavaScript redirect to another URL.
issues response codesinternal
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/noindex-only-in-original-html/
Issues - JavaScript : Noindex Only in Original HTML | Screaming Frog
Feb 27, 2024 - Pages that contain a noindex in the raw HTML, and not in the rendered HTML. When Googlebot encounters a noindex tag, it skips rendering and JavaScript...
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https://www.screamingfrog.co.uk/seo-spider/issues/pagespeed/remove-unused-javascript/
Issues - PageSpeed : Reduce Unused JavaScript | Screaming Frog
Oct 15, 2025 - Pages with unused JavaScript that are larger than necessary in bytes and reducing page speed.
issues pagespeed reduceunused
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/canonical-mismatch/
Issues - JavaScript : Canonical Mismatch | Screaming Frog
Dec 18, 2025 - Pages that contain a different canonical link in the raw HTML to the rendered HTML after JavaScript execution. Google can process canonicals in the rendered...
issues javascript canonical
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/page-title-updated-by-javascript/
Issues - JavaScript : Page Title Updated by JavaScript | Screaming Frog
Feb 27, 2024 - Pages that have page titles that are modified by JavaScript. This means the page title in the raw HTML is different to the page title in the rendered HTML.
issues javascripttitleupdated
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/
Issues - JavaScript | Screaming Frog
Search engines today are typically able to render web pages to crawl and index pages that use JavaScript. However, JavaScript-rich websites that rely on...
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https://www.screamingfrog.co.uk/blog/javascript-issues/
So You’ve Found JavaScript Issues in Your Site Crawl. What Now? - Screaming Frog
Mar 12, 2025 - Vue. React. Angular. There are more JavaScript frameworks and libraries than there have ever been — though don’t quote me on that — and there are new ones...
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https://www.screamingfrog.co.uk/seo-spider/issues/javascript/uses-old-ajax-crawling-scheme-meta-fragment-tag/
Issues - JavaScript : Uses Old AJAX Crawling Scheme Meta Fragment Tag | Screaming Frog
Feb 27, 2024 - URLs include a meta fragment tag that indicates the page is still using the Old AJAX crawling scheme which was officially deprecated as of October 2015.
issues javascript usesoldajax
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/page-title-only-in-rendered-html/
Issues - JavaScript : Page Title Only in Rendered HTML | Screaming Frog
Feb 27, 2024 - Pages that contain a page title only in the rendered HTML after JavaScript execution. This means a search engine must render the page to see it.
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https://www.screamingfrog.co.uk/seo-spider/issues/pagespeed/minify-javascript/
Issues - PageSpeed : Minify JavaScript | Screaming Frog
Oct 15, 2025 - Pages with unminified JavaScript files that are larger than necessary in bytes and reducing page speed.
issues pagespeed minifyfrog
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/pages-with-blocked-resources/
Issues - JavaScript : Pages with Blocked Resources | Screaming Frog
Feb 27, 2024 - Pages with resources (such as images, JavaScript and CSS) that are blocked from rendering by robots.txt or an error. This filter will only populate when...
issues javascript pagesfrog
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/h1-only-in-rendered-html/
Issues - JavaScript : H1 Only in Rendered HTML | Screaming Frog
Feb 27, 2024 - Pages that contain an h1 only in the rendered HTML after JavaScript execution. This means a search engine must render the page to see it.
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https://www.screamingfrog.co.uk/seo-spider/issues/javascript/pages-with-javascript-errors/
Issues - JavaScript : Pages With JavaScript Errors | Screaming Frog
Feb 27, 2024 - Pages with JavaScript errors captured in the Chrome DevTools console log during page rendering. While JavaScript errors are common and often have little effect...
issues javascript pageserrors
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/meta-description-updated-by-javascript/
Issues - JavaScript : Meta Description Updated by JavaScript | Screaming Frog
Feb 27, 2024 - Pages that have meta descriptions that are modified by JavaScript. This means the meta description in the raw HTML is different to the meta description in the...
issues javascript metaupdated
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/contains-javascript-links/
Issues - JavaScript : Contains JavaScript Links | Screaming Frog
Feb 27, 2024 - Pages that contain hyperlinks that are only discovered in the rendered HTML after JavaScript execution. These hyperlinks are not in the raw HTML.
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https://www.screamingfrog.co.uk/seo-spider/issues/javascript/uses-old-ajax-crawling-scheme-urls/
Issues - JavaScript : Uses Old AJAX Crawling Scheme URLs | Screaming Frog
Feb 27, 2024 - URLs that are still using the Old AJAX crawling scheme (a URL containing a #! hash fragment) which was officially deprecated as of October 2015.
issues javascript usesoldajax
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/nofollow-only-in-original-html/
Issues - JavaScript : Nofollow Only in Original HTML | Screaming Frog
Feb 27, 2024 - Pages that contain a meta robots nofollow in the raw HTML, and not in the rendered HTML. This means any hyperlinks in the raw HTML pre to JavaScript execution...
html screaming frogissues
https://www.screamingfrog.co.uk/seo-spider/issues/javascript/meta-description-only-in-rendered-html/
Issues - JavaScript : Meta Description Only in Rendered HTML | Screaming Frog
Feb 27, 2024 - Pages that contain a meta description only in the rendered HTML after JavaScript execution. This means a search engine must render the page to see it.
issues javascript metahtml
https://www.screamingfrog.co.uk/seo-spider/tutorials/crawl-javascript-seo/
How To Crawl JavaScript Websites - Screaming Frog
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https://www.screamingfrog.co.uk/seo-spider/issues/pagespeed/reduce-javascript-execution-time/
Issues - PageSpeed : Reduce JavaScript Execution Time | Screaming Frog
Oct 15, 2025 - Pages with average or slow JavaScript execution time (over 2 seconds). When JavaScript takes a long time to execute, it slows down page performance.
issues pagespeed reducetime