stefanolsen .com

4.49

Results collected 2024-04-05 from https://stefanolsen.com/

Lighthouse Performance

4.40

The website is fast.
Total Blocking Time 5.00
Largest Contentful Paint: 3.2 s 3.65
Cumulative Layout Shift 5.00
First Contentful Paint: 2.8 s 2.85
Speed Index: 3.2 s 4.60
Eliminate render-blocking resources 1.00
Largest Contentful Paint element 1.00
Reduce unused JavaScript 1.00
Avoid serving legacy JavaScript to modern browsers: Potential savings of 0 KiB 2.50
Reduce unused CSS: Potential savings of 26 KiB 2.50
Serve static assets with an efficient cache policy: 4 resources found 2.50
First Meaningful Paint: 2.8 s 4.00
Max Potential First Input Delay: 130 ms 4.55
Time to Interactive: 3.4 s 4.65
All text remains visible during webfont loads 5.00
Avoid chaining critical requests 5.00
Avoid long main-thread tasks 5.00
Avoid multiple page redirects 5.00
Avoids document.write() 5.00
Avoids an excessive DOM size 5.00
Avoids enormous network payloads 5.00
Defer offscreen images 5.00
Diagnostics 5.00
Efficiently encode images 5.00
Enable text compression 5.00
Final Screenshot 5.00
Has a <meta name="viewport"> tag with width or initial-scale 5.00
Image elements have explicit width and height 5.00
Initial server response time was short 5.00
JavaScript execution time 5.00
Metrics 5.00
Minify CSS 5.00
Minify JavaScript 5.00
Minimize third-party usage 5.00
Minimizes main-thread work 5.00
Network Requests 5.00
Network Round Trip Times 5.00
Preconnect to required origins 5.00
Properly size images 5.00
Remove duplicate modules in JavaScript bundles 5.00
Resources Summary 5.00
Screenshot Thumbnails 5.00
Script Treemap Data 5.00
Serve images in next-gen formats 5.00
Server Backend Latencies 5.00
Tasks 5.00
Use HTTP/2 5.00
Use video formats for animated content 5.00
User Timing marks and measures 5.00
Uses passive listeners to improve scrolling performance 5.00
Enable text compression 5.00

Lighthouse SEO

5.00

The website is really good at SEO!
Document avoids plugins 5.00
Document has a <title> element 5.00
Document has a meta description 5.00
Document has a valid hreflang 5.00
Document has a valid rel=canonical 5.00
Document uses legible font sizes 5.00
Has a <meta name="viewport"> tag with width or initial-scale 5.00
Links are crawlable 5.00
Links have descriptive text 5.00
Page has successful HTTP status code 5.00
Page isn’t blocked from indexing 5.00
Tap targets are sized appropriately 5.00
robots.txt is valid 5.00

Lighthouse Best Practices

3.90

About average on following good practice
Uses third-party cookies 1.00
Avoids deprecated APIs 5.00
Issues were logged in the Issues panel in Chrome Devtools 1.00
Uses HTTPS 5.00
Allows users to paste into input fields 5.00
Avoids unload event listeners 5.00
Avoids requesting the geolocation permission on page load 5.00
Avoids requesting the notification permission on page load 5.00
Displays images with correct aspect ratio 5.00
No browser errors logged to the console 5.00
Page has the HTML doctype 5.00
Properly defines charset 5.00
Serves images with appropriate resolution 5.00
Ensure CSP is effective against XSS attacks 5.00
Page has valid source maps 5.00
Uses HTTPS 5.00
Issues were logged in the Issues panel in Chrome Devtools 1.00
Allows users to paste into input fields 5.00
Avoids deprecated APIs 5.00
Page has the HTML doctype 5.00

W3C HTML

5.00

No errors in the HTML code.
Number of grouped error type: 0 5.00
Number of errors: 0 5.00

Standard Files

5.00

robots.txt seems ok. 5.00
Sitemap seems to work. 5.00
RSS subscription found. 5.00
security.txt seems to work. 5.00

Lighthouse A11y

5.00

The website do not have any apparent issues with accessibility!
[aria-*] attributes are valid and not misspelled 5.00
[aria-*] attributes have valid values 5.00
[aria-*] attributes match their roles 5.00
[aria-hidden="true"] is not present on the document <body> 5.00
[role]s have all required [aria-*] attributes 5.00
[user-scalable="no"] is not used in the <meta name="viewport"> element and the [maximum-scale] attribute is not less than 5. 5.00
Background and foreground colors have a sufficient contrast ratio 5.00
Document has a <title> element 5.00
Links have a discernible name 5.00
List items (<li>) are contained within <ul>, <ol> or <menu> parent elements 5.00
Lists contain only <li> elements and script supporting elements (<script> and <template>). 5.00
<html> element has a [lang] attribute 5.00
<html> element has a valid value for its [lang] attribute 5.00
[role] values are valid 5.00
Heading elements appear in a sequentially-descending order 5.00
Values assigned to role="" are valid ARIA roles. 5.00
Document has a main landmark. 5.00

Sitespeed.io

4.63

The website is fast. 4.63
Speedindex: 867 4.63
Loading time: 1.35s
Number of requests: 15

Yellow Lab Tools

4.90

The website has good frontend code. 4.90
Page weight 5.00
Requests 5.00
DOM complexity 5.00
JS complexity 5.00
Bad JS 5.00
jQuery 5.00
CSS complexity 4.00
Bad CSS 4.40
Web fonts 5.00
Server config 4.35
Number of iframes 5.00
Total JS execution time 5.00
DOM access 5.00
Scroll events bound 5.00
document.write calls 5.00
Synchronous Ajax requests 5.00
Rules count 5.00
Total weight 5.00
Image optimization 5.00
Oversized images 5.00
Gzip/Brotli compression 5.00
File minification 5.00
Requests number 5.00
Different domains 5.00
404 not found 5.00
Connections closed 5.00
Identical content 5.00
Below the fold images 5.00
Webfonts number 5.00
Overweighted webfonts 5.00
WOFF 2 5.00
HTTP protocols 5.00
TLS protocols 2.00
Caching disabled 5.00
Caching not specified 5.00
Caching too short 5.00
TLS protocols 2.00
IDs duplicated 5.00
CSS syntax error 5.00
Gzip/Brotli compression 5.00
404 not found 5.00
TLS protocols 2.00

Pa11y

4.75

The website can be more accessible, but is rather good!
Number of error type: 1 4.80
Number of errors: 3 4.70

Problems:

Elements must have sufficient color contrast (https://dequeuniversity.com/rules/axe/4.2/color-contrast?application=axeAPI)

Integrity & Security

3.06

Ok integrity but should get better.
Result generated: 2024-04-05 08:40:19 Etc/UTC (Cached for 24 hours)
HTTPS by default: is good! 5.00
HTTP Strict Transport Security HSTS: is ok, with 2 error(s) and 0 warning(s). 4.00
Content Security Policy: is pretty bad. 1.00
Reporting CSP Certificate Transparency Network Error Logging: is good! 5.00
Referrer Policy: is not that good. 2.50
Subresource Integrity SRI: is pretty bad. 1.00
HTTP headers: is good! 5.00
Cookies: is ok, with 12 error(s) and 0 warning(s). 1.00

HTTP & Tech

3.22

HTTP to HTTPS redirect 5.00
No TLSv1.3 support 1.00
TLSv1.2 support 5.00
No IPv6 support 1.00
IPv4 support 5.00
No HTTPv3 support 1.00
No QUIC support 1.00

Carbon Calculator

5.00

Webpage generates very little carbon dioxide!
Carbon dioxide per pageview: 0.14 gram(s)
More green than 98 % of the websites tested by webperf.se (Reference updated: 2022-12-16).
More green than 97 % of the websites tested by webperf.se (Reference updated: 2021-12-12).
Network transfer size: 232 kb 5.00