Module Documentation for Code

Avoids application cache
JavaScript execution time
Links must point to a valid and active URL
Properly defines charset
Avoid chaining critical requests
Avoids deprecated APIs
Page has the HTML doctype
Avoids an excessive DOM size
Remove duplicate modules in JavaScript bundles
Use video formats for animated content
No browser errors logged to the console
All text remains visible during webfont loads
Avoids requesting the geolocation permission on page load
Duplicate page found
<audio> element not supported by FIREFOX
<dialog> element not supported by FIREFOX
<dialog> element not supported by SAFARI
<input type="color"> element not supported by FIREFOX
<input type="color"> element not supported by SAFARI
<input type="date"> element not supported by SAFARI
<input type"datetime-local"> element not supported by FIREFOX
<input type"datetime-local"> element not supported by SAFARI
<input type="month"> element not supported by FIREFOX
<input type="month"> element not supported by SAFARI
<input type="time"> element not supported by SAFARI
<input type="week"> element not supported by FIREFOX
<input type="week"> element not supported by SAFARI
<video> element not supported by FIREFOX
Displays images with correct aspect ratio
Serves images with appropriate resolution
No issues in the Issues panel in Chrome DevTools
Documents must not be corrupt
Soft 404
Minify CSS
Minify JavaScript
Image elements have explicit width and height
Remove unused CSS
Remove unused JavaScript
Uses passive listeners to improve scrolling performance
Enable text compression
Serve images in next-gen formats
Page has valid source maps