stefanolsen .com

4.65

Results collected 2023-09-07 from https://stefanolsen.com/

Lighthouse Performance

4.80

The website is fast.
Total Blocking Time 5.00
Largest Contentful Paint: 2.6 s 4.40
Cumulative Layout Shift 5.00
First Contentful Paint: 1.7 s 4.60
Speed Index 5.00
Page prevented back/forward cache restoration 1.00
Reduce unused JavaScript: Potential savings of 31 KiB 3.40
Eliminate render-blocking resources: Potential savings of 430 ms 3.50
Max Potential First Input Delay: 180 ms 3.75
Time to Interactive: 3.2 s 4.70
First Meaningful Paint: 1.7 s 4.90
All text remains visible during webfont loads 5.00
Avoid multiple page redirects 5.00
Avoid serving legacy JavaScript to modern browsers 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
Efficiently encode images 5.00
Enable text compression 5.00
Has a <meta name="viewport"> tag with width or initial-scale 5.00
Initial server response time was short 5.00
JavaScript execution time 5.00
Minify CSS 5.00
Minify JavaScript 5.00
Minimize third-party usage 5.00
Minimizes main-thread work 5.00
Preconnect to required origins 5.00
Properly size images 5.00
Reduce unused CSS 5.00
Remove duplicate modules in JavaScript bundles 5.00
Serve images in next-gen formats 5.00
Use HTTP/2 5.00
Use video formats for animated content 5.00
Uses efficient cache policy on static assets 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

5.00

The website is adhering to good practice according to Google Lighthouse!
Avoids deprecated APIs 5.00
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
No issues in the Issues panel in Chrome Devtools 5.00
Page has the HTML doctype 5.00
Properly defines charset 5.00
Serves images with appropriate resolution 5.00
Page has valid source maps 5.00
Uses HTTPS 5.00
No issues in the Issues panel in Chrome Devtools 5.00
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

Sitespeed.io

4.67

The website is fast. 4.67
Speedindex: 834 4.67
Loading time: 1.28s
Number of requests: 13

Yellow Lab Tools

4.90

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/4.4/color-contrast?application=axeAPI)

Integrity & Security

3.06

Ok integrity but should get better.
Result generated: 2023-09-06 17:01:13 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: 0.08 gram(s)
More green than 99 % of the websites tested by webperf.se (Reference updated: 2022-12-16).
More green than 99 % of the websites tested by webperf.se (Reference updated: 2021-12-12).
Network transfer size: 133 kb 5.00

Software

5.00

Metadata used: open-graph, viewport, canonical
Languages found: en
Image formats used: svg, ico