-
Internal No Response
-
Internal Client Error (4XX)
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Internal Server Error (5XX)
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Internal Redirect Loop
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Internal Blocked by Robots.txt
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Internal Blocked Resource
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Internal Redirect Chain
-
External Blocked Resource
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Internal Redirection (3XX)
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Internal Redirection (Meta Refresh)
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Internal Redirection (JavaScript)
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External No Response
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External Client Error (4XX)
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External Server Error (5XX)
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HTTP URLs
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Mixed Content
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Form URL Insecure
-
Form On HTTP URL
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Missing HSTS Header
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Unsafe Cross Origin Links
-
Protocol-Relative Resource Links
-
Missing Content-Security-Policy Header
-
Missing X-Content-Type-Options Header
-
Missing X-Frames-Options Header
-
Missing Secure Referrer-Policy Header
-
Bad Content Type
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Noindex Only in Original HTML
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Nofollow Only in Original HTML
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Canonical Mismatch
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Uses Old AJAX Crawling Scheme URLs
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Uses Old AJAX Crawling Scheme Meta Fragment Tag
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Pages with Blocked Resources
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Contains JavaScript Links
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Contains JavaScript Content
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Page Title Only in Rendered HTML
-
Page Title Updated by JavaScript
-
Meta Description Only in Rendered HTML
-
Meta Description Updated by JavaScript
-
H1 Only in Rendered HTML
-
H1 Updated by JavaScript
-
Canonical Only in Rendered HTML
-
Pages With JavaScript Errors
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Outlinks To Localhost
-
Pages Without Internal Outlinks
-
Non-Indexable Page Inlinks Only
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Internal Nofollow Outlinks
-
Pages With High External Outlinks
-
Pages With High Internal Outlinks
-
Follow & Nofollow Internal Inlinks To Page
-
Internal Nofollow Inlinks Only
-
Pages With High Crawl Depth
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Internal Outlinks With No Anchor Text
-
Non-Descriptive Anchor Text In Internal Outlinks
-
Non-200 Response
-
Missing Non-AMP Return Link
-
Missing Canonical to Non-AMP
-
Non-Indexable Canonical
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Missing <html amp> Tag
-
Missing/Invalid Doctype HTML Tag
-
Missing Head Tag
-
Missing Body Tag
-
Missing Canonical
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Missing/Invalid Meta Charset Tag
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Missing/Invalid Meta Viewport Tag
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Missing/Invalid AMP Script
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Missing/Invalid AMP Boilerplate
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Contains Disallowed HTML
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Other Validation Errors
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Indexable
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Eliminate Render-Blocking Resources
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Properly Size Images
-
Defer Offscreen Images
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Minify CSS
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Minify JavaScript
-
Reduce Unused CSS
-
Reduce Unused JavaScript
-
Efficiently Encode Images
-
Serve Images in Next-Gen Formats
-
Enable Text Compression
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Preconnect to Required Origin
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Reduce Server Response Times (TTFB)
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Preload Key Requests
-
Reduce JavaScript Execution Time
-
Serve Static Assets With An Efficient Cache Policy
-
Minimize Main-Thread Work
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Image Elements Do Not Have Explicit Width & Height
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Avoid Large Layout Shifts
-
Avoid Serving Legacy JavaScript to Modern Browsers
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Avoid Multiple Page Redirects
-
Use Video Format for Animated Images
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Avoid Excessive DOM Size
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Ensure Text Remains Visible During Webfont Load
Viewport Not Set
Pages without a viewport meta tag, or a viewport meta tag without a content attribute that includes the text width=.
Setting the viewport meta tag allows the width and scaling to be sized correctly on all devices.
Without this set, mobile devices will render pages at desktop screen widths and scale them down, making the text difficult to read.
How to Analyse in the SEO Spider
To populate this filter the PageSpeed Insights API must be connected via ‘Config > API Access > PSI’.
View URLs with this issue in the ‘Mobile’ tab and ‘Viewport Not Set’ filter, and export all URLs using the ‘Export’ button.
What Triggers This Issue
This issue is triggered by Lighthouse when pages do not have a viewport meta tag, or the viewport meta tag is missing the content attribute that includes the text width=.
Lighthouse does not check the width equals device-width, or for an initial-scale key value pair. However, you still need to include both for your page to render correctly on mobile devices.
How To Fix
Add a viewport meta tag with the appropriate key-value pairs to the <head> of the page so that it’s sized correctly on all devices.
Further Reading
- Does not have a tag with width or initial-scale - From Chrome for developers
