docs .developers .optimizely .com

3.73

Results collected 2023-09-07 from https://docs.developers.optimizely.com/

Lighthouse Performance

2.60

The website is quite slow.
Total Blocking Time: 220 ms 4.40
Largest Contentful Paint 1.00
Cumulative Layout Shift 5.00
First Contentful Paint 1.00
Speed Index: 10.3 s 1.00
First Meaningful Paint: 10.3 s 1.00
Minimize main-thread work: 7.6 s 1.00
Page prevented back/forward cache restoration 1.00
Reduce initial server response time 1.00
Reduce the impact of third-party code 1.00
Reduce unused JavaScript: Potential savings of 1,224 KiB 1.00
Time to Interactive: 16.2 s 1.00
Max Potential First Input Delay: 370 ms 1.05
Reduce JavaScript execution time: 3.0 s 2.85
Reduce unused CSS: Potential savings of 108 KiB 3.00
Eliminate render-blocking resources: Potential savings of 480 ms 3.35
Preconnect to required origins: Potential savings of 330 ms 3.80
Serve static assets with an efficient cache policy: 4 resources found 4.05
Avoid enormous network payloads: Total size was 2,693 KiB 4.45
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
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
Image elements have explicit width and height 5.00
Minify CSS 5.00
Minify JavaScript 5.00
Properly size images 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 passive listeners to improve scrolling performance 5.00
Enable text compression 5.00

Lighthouse SEO

4.55

Pretty good at SEO, but still has some potential improvements.
Document does not have a meta description 1.00
Tap targets are not sized appropriately: 96% appropriately sized tap targets 4.30
Document avoids plugins 5.00
Document has a <title> element 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
robots.txt is valid 5.00

Lighthouse Best Practices

4.75

The website can still make some improvements on best practice.
Avoids deprecated APIs 5.00
Browser errors were logged to the console 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 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

2.30

The tested page has 68 errors in its HTML code. It is not that good.
Number of grouped error type: 7 3.60
Number of errors: 68 1.00
A X element with an X attribute must have a X attribute that contains the value X or the value X. (errors of this type: 54 pcs)
Element X not allowed as child of element X in this context. (Suppressing further errors from this subtree.) (errors of this type: 5 pcs)
Attribute X not allowed on element X at this point. (errors of this type: 4 pcs)
CSS: X: Too many values or values are not recognized. (errors of this type: 2 pcs)
Element X is missing one or more of the following attributes: X, X. (errors of this type: 1 pcs)
Element X is missing required attribute X. (errors of this type: 1 pcs)
CSS: Parse Error. (errors of this type: 1 pcs)

Standard Files

2.88

robots.txt seems ok. 5.00
Sitemap is not specified in robots.txt 1.00
RSS subscription is missing in the HTMLs metadata. 4.50
security.txt has wrong content. 1.00

Lighthouse A11y

4.65

The website can be more accessible, but is rather good!
<html> element does not have a [lang] attribute 1.00
ARIA IDs are unique 5.00
Buttons have an accessible name 5.00
[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
Heading elements are not in a sequentially-descending order 1.00
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
No element has a [tabindex] value greater than 0 5.00
[role] values are valid 5.00
Values assigned to role="" are valid ARIA roles. 5.00

Sitespeed.io

3.92

About average speed. 3.92
Speedindex: 1580 3.92
Loading time: 2.35s
Number of requests: 129

Yellow Lab Tools

3.25

The website is neither good nor bad. 3.25
Page weight 1.50
Requests 2.40
DOM complexity 5.00
JS complexity 4.10
Bad JS 5.00
jQuery 5.00
CSS complexity 1.15
Bad CSS 1.00
Web fonts 4.55
Server config 5.00
Number of iframes 5.00
Total JS execution time 3.45
DOM access 5.00
Scroll events bound 5.00
document.write calls 5.00
Synchronous Ajax requests 5.00
Rules count 1.00
Total weight 1.10
Image optimization 5.00
Oversized images 5.00
Gzip/Brotli compression 1.00
File minification 1.00
Requests number 3.55
Different domains 5.00
404 not found 1.00
Connections closed 5.00
Identical content 2.00
Below the fold images 5.00
Webfonts number 5.00
Overweighted webfonts 3.25
WOFF 2 5.00
HTTP protocols 5.00
TLS protocols 5.00
Caching disabled 5.00
Caching not specified 5.00
Caching too short 5.00
TLS protocols 5.00
IDs duplicated 5.00
CSS syntax error 1.00
Gzip/Brotli compression 1.00
404 not found 1.00
TLS protocols 5.00

Pa11y

4.70

The website can be more accessible, but is rather good!
Number of error type: 2 4.60
Number of errors: 2 4.80

Problems:

A link points to a named anchor "content" within the document, but no anchor exists with that name.
The html element should have a lang or xml:lang attribute which describes the language of the document.

Integrity & Security

3.03

Ok integrity but should get better.
Result generated: 2023-09-06 16:56:19 Etc/UTC (Cached for 24 hours)
HTTPS by default: is good! 5.00
HTTP Strict Transport Security HSTS: is ok, with 1 error(s) and 1 warning(s). 4.25
Content Security Policy: is pretty bad. 1.00
Reporting CSP Certificate Transparency Network Error Logging: is good! 5.00
Referrer Policy: is pretty bad. 1.00
Subresource Integrity SRI: is pretty bad. 1.00
HTTP headers: is good! 5.00
Cookies: is ok, with 6 error(s) and 0 warning(s). 2.00

HTTP & Tech

5.00

HTTP to HTTPS redirect 5.00
TLSv1.3 support 5.00
TLSv1.2 support 5.00
IPv6 support 5.00
IPv4 support 5.00
HTTPv3 support 5.00
QUIC support 5.00

Carbon Calculator

1.85

The webpage generates some more carbon dioxide than is preferable :/
Carbon dioxide per pageview: 1.64 gram(s)
More green than 37 % of the websites tested by webperf.se (Reference updated: 2022-12-16).
More green than 38 % of the websites tested by webperf.se (Reference updated: 2021-12-12).
Network transfer size: 3 mb 1.85

Software

5.00

Technology used: js, typescript
License(s) used: mit, apache-2.0
Metadata used: open-graph, viewport, canonical
JS Libraries used: core-js, date-fns, uuid, cash, focus-lock, crypto-browserify, clj-http, request, ocaml-cohttp, async-http-client, axios, node-fetch, algoliasearch-client-javascript
Languages found: en
Image formats used: svg, png