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 withwidth
orinitial-scale
5.00 - Image elements have explicit
width
andheight
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 withwidth
orinitial-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