Webperf result optimizely.blog

Standards section:
- Page not found, no valid title foundwarning
Tested:
- https://optimizely.blog/012d4/finns-det-en-sida/pa-den-har-adressen/testanrop/

- Page not found, has expected 404 responseok
- Page not found, valid h1 header foundok
- Page not found, valid text foundok
- Page not found, valid text foundok
- Page not found, valid 404 response status code usedok
- Page not found, used supported localeok
- Page not found, valid body text foundok
- Page not found, network is usableok

Security section:
- Sitemap, Url in <loc> has to start with https://ok
- security.txt is missingok
- security.txt has incorrect contentok
- security.txt is missing the required contact infook
- security.txt requires expiration information (added in draft v10) is missingok

Standards section:
- Sitemap, Url in <loc> must use same domain as robots.txtwarning
Tested:
- https://optimizely.blog/

- robots.txt is missing, not allowed to download or has not the expected contentok
- Sitemap is not specified in robots.txtok
- Sitemap, no valid sitemap foundok
- Sitemap, No duplicate Urls in <loc> allowedok
- Sitemap, lists other stuff then webpagesok
- Sitemap, is exceeding 50 000 itemsok
- Sitemap, has no itemsok
- Feed is missing in the HTML's metadataok

Performance section:
- [desktop] TTFB (Time to First Byte): 186.67ms, ±25.33ms 5.00
- [desktop] DOMContentLoaded: 434.67ms, ±22.33ms 5.00
- [desktop] LCP (Largest Contentful Paint): 506.00ms, ±2.00ms 3.00
- [desktop] Load: 689.67ms, ±35.33ms 4.62
- [desktop] CLS (Cumulative Layout Shift): 0.00ms, ±0.00ms 5.00
- [desktop] FirstVisualChange: 533.00ms, ±33.00ms 4.93
- [desktop] SpeedIndex: 544.00ms, ±32.00ms 4.91
- [desktop] VisualComplete85: 533.00ms, ±33.00ms 4.93
- [desktop] FCP (First Contentful Paint): 506.00ms, ±0.00ms 5.00
- [desktop] TBT (Total Blocking Time): 0.00ms, ±0.00ms 5.00
- [desktop] firstPaint: 506.00ms, ±2.00ms
- [desktop] LastVisualChange: 1585.00ms, ±15.00ms
- [mobile] TTFB (Time to First Byte): 167.00ms, ±4.00ms 5.00
- [mobile] DOMContentLoaded: 399.67ms, ±22.33ms 5.00
- [mobile] LCP (Largest Contentful Paint): 436.00ms, ±32.00ms 5.00
- [mobile] Load: 573.00ms, ±16.00ms 5.00
- [mobile] FirstVisualChange: 433.50ms, ±33.50ms 5.00
- [mobile] SpeedIndex: 437.50ms, ±36.50ms 5.00
- [mobile] VisualComplete85: 433.50ms, ±33.50ms 5.00
- [mobile] FCP (First Contentful Paint): 436.00ms, ±0.00ms 5.00
- [mobile] CLS (Cumulative Layout Shift): 0.00ms, ±0.00ms 5.00
- [mobile] TBT (Total Blocking Time): 0.00ms, ±0.00ms 5.00
- [mobile] firstPaint: 436.00ms, ±32.00ms
- [mobile] LastVisualChange: 717.00ms, ±283.00ms

- No report data created.

- About average privacy settings, but should get better.

Security section:
- HTTPS by default is good! 5.00
- HTTP Strict Transport Security HSTS is good! 5.00
- Content Security Policy is pretty bad. 1.00
- Reporting CSP Certificate Transparency Network Error Logging is good! 5.00
- Referrer Policy is good! 5.00
- Subresource Integrity SRI is pretty bad. 1.00
- HTTP headers is good! 5.00
- Cookies is ok, with 3 error(s) and 0 warning(s). 3.50

- Webpage generates very little carbon dioxide!
- Carbon dioxide per pageview: 0.89 gram(s)
- More green than 95 % of the websites tested by webperf.se (Reference updated: 2025-01-09).
- Network transfer size: 1.41 MB 5.00

- CMS used: episerver
- Web server used: microsoft-httpapi, nginx
- Technology used: asp.net, c, csharp, js, sass, scss, typescript
- Metadata used: canonical, icon, open-graph, preload, viewport
- Javascript libraries used: applicationinsights-js, bootstrap, jquery, plausible-analytics
- Languages found: en, en_us
- Image formats used: ico, png, svg, webp

Accessibility section:
##### You don't seem to be using accessibility overlay software 5.00

Security section:
##### Software is behind >=25 versions 2.75

###### Introduction:
Software used is behind 25 or more version compared to latests.
This is a good indicator that you need to update to latest version.
It also indicate that you don't have a good package routine for your software.
You can fix this by updating software to latest version.

###### Detected software(s):
- applicationinsights-js 2.8.18

###### Affected resource(s):
- https://az416426.vo.msecnd.net/scripts/b/ai.2.min.js
##### Software is behind >=10 versions 3.0

###### Introduction:
Software used is behind 10 or more version compared to latests.
This is a semi good indicator that you need to update to latest version.
It also indicate that you don't have a good package routine for your software.
You can fix this by updating software to latest version.

###### Detected software(s):
- bootstrap 5.0.2

###### Affected resource(s):
- https://optimizely.blog/js/jsbundle.js?v=7czMwn7jwxfukbjq_S6UilOBN9bqwmcEa_6UvS4jL1g
##### Software is behind >=1 versions 4.9

###### Introduction:
Software used is behind 1 or more version compared to latests.
This is a small indicator that you need to update to latest version.
You can fix this by updating software to latest version.

###### Detected software(s):
- jquery 3.6.0

###### Affected resource(s):
- https://optimizely.blog/js/jsbundle.js?v=7czMwn7jwxfukbjq_S6UilOBN9bqwmcEa_6UvS4jL1g
##### NO Common Vulnerabilities and Exposures found 5.00
##### Opensource software used seem to be maintained 5.00
##### You don't seem to be using 'END OF LIFE' software 5.00

Standards section:
- CSS, Disallow unknown values for properties within declarationserror
More info:
- https://stylelint.io/user-guide/rules/declaration-property-value-no-unknown

Tested:
- https://optimizely.blog/css/main.css?1.1.0.0

- CSS, Disallow unknown custom propertieserror
More info:
- https://stylelint.io/user-guide/rules/no-unknown-custom-properties

Tested:
- https://optimizely.blog/css/main.css?1.1.0.0

- CSS, Disallow deprecated keywords for properties within declarationswarning
More info:
- https://stylelint.io/user-guide/rules/declaration-property-value-keyword-no-deprecated

Tested:
- https://optimizely.blog/css/main.css?1.1.0.0

- CSS, Disallow unknown annotationsok
More info:
- https://stylelint.io/user-guide/rules/annotation-no-unknown

- CSS, Disallow unknown descriptors for at-rulesok
More info:
- https://stylelint.io/user-guide/rules/at-rule-descriptor-no-unknown

- CSS, Disallow unknown values for descriptors within at-rulesok
More info:
- https://stylelint.io/user-guide/rules/at-rule-descriptor-value-no-unknown

- CSS, Disallow deprecated at-rulesok
More info:
- https://stylelint.io/user-guide/rules/at-rule-no-deprecated

- CSS, Disallow unknown at-rulesok
More info:
- https://stylelint.io/user-guide/rules/at-rule-no-unknown

- CSS, Disallow invalid preludes for at-rulesok
More info:
- https://stylelint.io/user-guide/rules/at-rule-prelude-no-invalid

- CSS, Disallow empty blocksok
More info:
- https://stylelint.io/user-guide/rules/block-no-empty

- CSS, Disallow invalid hex colorsok
More info:
- https://stylelint.io/user-guide/rules/color-no-invalid-hex

- CSS, Disallow empty commentsok
More info:
- https://stylelint.io/user-guide/rules/comment-no-empty

- CSS, Disallow non-standard direction values for linear gradient functionsok
More info:
- https://stylelint.io/user-guide/rules/function-linear-gradient-no-nonstandard-direction

- CSS, Disallow unknown functionsok
More info:
- https://stylelint.io/user-guide/rules/function-no-unknown

- CSS, Disallow unknown media feature namesok
More info:
- https://stylelint.io/user-guide/rules/media-feature-name-no-unknown

- CSS, Disallow unknown values for media featuresok
More info:
- https://stylelint.io/user-guide/rules/media-feature-name-value-no-unknown

- CSS, Disallow invalid media queriesok
More info:
- https://stylelint.io/user-guide/rules/media-query-no-invalid

- CSS, Disallow invalid named grid areasok
More info:
- https://stylelint.io/user-guide/rules/named-grid-areas-no-invalid

- CSS, Disallow empty sourcesok
More info:
- https://stylelint.io/user-guide/rules/no-empty-source

- CSS, Disallow invalid double-slash commentsok
More info:
- https://stylelint.io/user-guide/rules/no-invalid-double-slash-comments

- CSS, Disallow invalid position `@import` rulesok
More info:
- https://stylelint.io/user-guide/rules/no-invalid-position-at-import-rule

- CSS, Disallow unknown animationsok
More info:
- https://stylelint.io/user-guide/rules/no-unknown-animations

- CSS, Disallow unknown custom media queriesok
More info:
- https://stylelint.io/user-guide/rules/no-unknown-custom-media

- CSS, Disallow unknown propertiesok
More info:
- https://stylelint.io/user-guide/rules/property-no-unknown

- CSS, Disallow unknown pseudo-class selectorsok
More info:
- https://stylelint.io/user-guide/rules/selector-pseudo-class-no-unknown

- CSS, Disallow unknown pseudo-element selectorsok
More info:
- https://stylelint.io/user-guide/rules/selector-pseudo-element-no-unknown

- CSS, Disallow unknown type selectorsok
More info:
- https://stylelint.io/user-guide/rules/selector-type-no-unknown

- CSS, Disallow invalid syntax stringsok
More info:
- https://stylelint.io/user-guide/rules/syntax-string-no-invalid

- CSS, Disallow unknown unitsok
More info:
- https://stylelint.io/user-guide/rules/unit-no-unknown

Standards section:
- Require attributes to be separated by whitespaceok
More info:
- https://html-validate.org/rules/attr-spacing.html

- Validate permitted attribute valuesok
More info:
- https://html-validate.org/rules/attribute-allowed-values.html

- Require attribute to be used in correct contextok
More info:
- https://html-validate.org/rules/attribute-misuse.html

- Disallow end tags from having attributesok
More info:
- https://html-validate.org/rules/close-attr.html

- Require elements to be closed in correct orderok
More info:
- https://html-validate.org/rules/close-order.html

- Disallow usage of deprecated elementsok
More info:
- https://html-validate.org/rules/deprecated.html

- Disallow usage of deprecated rulesok
More info:
- https://html-validate.org/rules/deprecated-rule.html

- Require usage of `html` doctypeok
More info:
- https://html-validate.org/rules/doctype-html.html

- Disallow invalid element namesok
More info:
- https://html-validate.org/rules/element-name.html

- Validate permitted contentok
More info:
- https://html-validate.org/rules/element-permitted-content.html

- Validate permitted number of element occurrencesok
More info:
- https://html-validate.org/rules/element-permitted-occurrences.html

- Validate required element orderok
More info:
- https://html-validate.org/rules/element-permitted-order.html

- Validate permitted element parentok
More info:
- https://html-validate.org/rules/element-permitted-parent.html

- Ensure required attributes are setok
More info:
- https://html-validate.org/rules/element-required-attributes.html

- Ensure required elements are presentok
More info:
- https://html-validate.org/rules/element-required-content.html

- Require `<map name>` to be uniqueok
More info:
- https://html-validate.org/rules/map-dup-name.html

- Require name and id to match on `<map>` elementsok
More info:
- https://html-validate.org/rules/map-id-name.html

- Disallow usage of deprecated attributesok
More info:
- https://html-validate.org/rules/no-deprecated-attr.html

- Disallow duplicated attributesok
More info:
- https://html-validate.org/rules/no-dup-attr.html

- Disallow duplicated IDsok
More info:
- https://html-validate.org/rules/no-dup-id.html

- Disallow multiple `<main>`ok
More info:
- https://html-validate.org/rules/no-multiple-main.html

- Disallow the use of unescaped special charactersok
More info:
- https://html-validate.org/rules/no-raw-characters.html

- Disallow unused disable directivesok
More info:
- https://html-validate.org/rules/no-unused-disable.html

- Require end tag for `<script>`ok
More info:
- https://html-validate.org/rules/script-element.html

- Disallow unrecognized character referencesok
More info:
- https://html-validate.org/rules/unrecognized-char-ref.html

- Require autocomplete attribute to be validok
More info:
- https://html-validate.org/rules/valid-autocomplete.html

- Require `id` to be a valid identifierok
More info:
- https://html-validate.org/rules/valid-id.html

- Disallow void element with contentok
More info:
- https://html-validate.org/rules/void-content.html

Security section:
- Javascript, require the use of === and !==error
More info:
- https://eslint.org/docs/latest/rules/eqeqeq

Tested:
- https://optimizely.blog/js/jsbundle.js?v=7czMwn7jwxfukbjq_S6UilOBN9bqwmcEa_6UvS4jL1g
- https://az416426.vo.msecnd.net/scripts/b/ai.2.min.js
- https://optimizely.blog/
- https://cdn.customgpt.ai/js/chat.js

- Javascript, disallow javascript: URLserror
More info:
- https://eslint.org/docs/latest/rules/no-script-url

Tested:
- https://az416426.vo.msecnd.net/scripts/b/ai.2.min.js
- https://optimizely.blog/

- Javascript, disallow calling some Object.prototype methods directly on objectswarning
More info:
- https://eslint.org/docs/latest/rules/no-prototype-builtins

Tested:
- https://optimizely.blog/js/jsbundle.js?v=7czMwn7jwxfukbjq_S6UilOBN9bqwmcEa_6UvS4jL1g
- https://az416426.vo.msecnd.net/scripts/b/ai.2.min.js

- Javascript, disallow async functions which have no await expressionwarning
More info:
- https://eslint.org/docs/latest/rules/require-await

Tested:
- https://cdn.customgpt.ai/js/chat.js

- Javascript, disallow the use of eval()ok
More info:
- https://eslint.org/docs/latest/rules/no-eval

- Javascript, disallow the use of eval()-like methodsok
More info:
- https://eslint.org/docs/latest/rules/no-implied-eval

- Javascript, disallow new operators with the Function objectok
More info:
- https://eslint.org/docs/latest/rules/no-new-func

- Javascript, disallow control flow statements in finally blocksok
More info:
- https://eslint.org/docs/latest/rules/no-unsafe-finally

- Javascript, disallow negating the left operand of relational operatorsok
More info:
- https://eslint.org/docs/latest/rules/no-unsafe-negation

- Javascript, disallow with statementsok
More info:
- https://eslint.org/docs/latest/rules/no-with

Standards section:
- Javascript, disallow unused variableswarning
More info:
- https://eslint.org/docs/latest/rules/no-unused-vars

Tested:
- https://az416426.vo.msecnd.net/scripts/b/ai.2.min.js
- https://optimizely.blog/js/plausible.js
- https://cdn.customgpt.ai/js/chat.js
- https://optimizely.blog/js/jsbundle.js?v=7czMwn7jwxfukbjq_S6UilOBN9bqwmcEa_6UvS4jL1g
- https://optimizely.blog/

- Javascript, disallow the use of undeclared variables unless mentioned in /*global */ commentswarning
More info:
- https://eslint.org/docs/latest/rules/no-undef

Tested:
- https://optimizely.blog/js/jsbundle.js?v=7czMwn7jwxfukbjq_S6UilOBN9bqwmcEa_6UvS4jL1g
- https://az416426.vo.msecnd.net/scripts/b/ai.2.min.js
- https://optimizely.blog/
- https://cdn.customgpt.ai/js/chat.js

- Javascript, disallow unnecessary escape characterswarning
More info:
- https://eslint.org/docs/latest/rules/no-useless-escape

Tested:
- https://optimizely.blog/js/jsbundle.js?v=7czMwn7jwxfukbjq_S6UilOBN9bqwmcEa_6UvS4jL1g
- https://az416426.vo.msecnd.net/scripts/b/ai.2.min.js
- https://optimizely.blog/

- Javascript, disallow the use of consolewarning
More info:
- https://eslint.org/docs/latest/rules/no-console

Tested:
- https://optimizely.blog/js/jsbundle.js?v=7czMwn7jwxfukbjq_S6UilOBN9bqwmcEa_6UvS4jL1g
- https://optimizely.blog/js/plausible.js
- https://cdn.customgpt.ai/js/chat.js

- Javascript, disallow unmodified loop conditionsok
More info:
- https://eslint.org/docs/latest/rules/no-unmodified-loop-condition

- Javascript, disallow unnecessary concatenation of literals or template literalsok
More info:
- https://eslint.org/docs/latest/rules/no-useless-concat

- Performance only 1.70
- Accessibility only 5.00

- Uses HTTPSok
Tested:
- https://optimizely.blog/

- geolocation-on-startok
Tested:
- https://optimizely.blog/

- notification-on-startok
Tested:
- https://optimizely.blog/

- csp-xssok
Tested:
- https://optimizely.blog/

- paste-preventing-inputsok
Tested:
- https://optimizely.blog/

- image-aspect-ratiook
Tested:
- https://optimizely.blog/

- Serves images with low resolutionok
Tested:
- https://optimizely.blog/

- Has a <meta name="viewport"> tag with width or initial-scaleok
Tested:
- https://optimizely.blog/

- font-sizeok
Tested:
- https://optimizely.blog/

- doctypeok
Tested:
- https://optimizely.blog/

- charsetok
Tested:
- https://optimizely.blog/

- js-librariesok
Tested:
- https://optimizely.blog/

- deprecationsok
Tested:
- https://optimizely.blog/

- third-party-cookiesok
Tested:
- https://optimizely.blog/

- errors-in-consoleok
Tested:
- https://optimizely.blog/

- valid-source-mapsok
Tested:
- https://optimizely.blog/

- No issues in the `Issues` panel in Chrome Devtoolsok
Tested:
- https://optimizely.blog/

- is-crawlableok
Tested:
- https://optimizely.blog/

- Document has a `<title>` elementok
Tested:
- https://optimizely.blog/

- meta-descriptionok
Tested:
- https://optimizely.blog/

- http-status-codeok
Tested:
- https://optimizely.blog/

- link-textok
Tested:
- https://optimizely.blog/

- crawlable-anchorsok
Tested:
- https://optimizely.blog/

- robots-txtok
Tested:
- https://optimizely.blog/

- Image elements have `[alt]` attributesok
Tested:
- https://optimizely.blog/

- hreflangok
Tested:
- https://optimizely.blog/

- canonicalok
Tested:
- https://optimizely.blog/

- Redirects HTTP traffic to HTTPSok
- has-hstsok
- origin-isolationok
- structured-dataok

Accessibility section:
- `[aria-*]` attributes match their rolesok
Tested:
- https://optimizely.blog/

- Uses ARIA roles only on compatible elementsok
Tested:
- https://optimizely.blog/

- ARIA attributes are used as specified for the element's roleok
Tested:
- https://optimizely.blog/

- `[aria-hidden="true"]` is not present on the document `<body>`ok
Tested:
- https://optimizely.blog/

- Elements use only permitted ARIA attributesok
Tested:
- https://optimizely.blog/

- `[aria-*]` attributes have valid valuesok
Tested:
- https://optimizely.blog/

- `[aria-*]` attributes are valid and not misspelledok
Tested:
- https://optimizely.blog/

- Buttons have an accessible nameok
Tested:
- https://optimizely.blog/

- Background and foreground colors have a sufficient contrast ratiook
Tested:
- https://optimizely.blog/

- Document has a `<title>` elementok
Tested:
- https://optimizely.blog/

- Heading elements appear in a sequentially-descending orderok
Tested:
- https://optimizely.blog/

- `<html>` element has a `[lang]` attributeok
Tested:
- https://optimizely.blog/

- `<html>` element has a valid value for its `[lang]` attributeok
Tested:
- https://optimizely.blog/

- Image elements have `[alt]` attributesok
Tested:
- https://optimizely.blog/

- Image elements do not have `[alt]` attributes that are redundant textok
Tested:
- https://optimizely.blog/

- labelok
Tested:
- https://optimizely.blog/

- Links are distinguishable without relying on colorok
Tested:
- https://optimizely.blog/

- Links have a discernible nameok
Tested:
- https://optimizely.blog/

- Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`)ok
Tested:
- https://optimizely.blog/

- List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elementsok
Tested:
- https://optimizely.blog/

- `[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5ok
Tested:
- https://optimizely.blog/

- skip-linkok
Tested:
- https://optimizely.blog/

- tabindexok
Tested:
- https://optimizely.blog/

- Touch targets have sufficient size and spacingok
Tested:
- https://optimizely.blog/

- identical-links-same-purposeok
Tested:
- https://optimizely.blog/

- accesskeysok
- aria-command-nameok
- Deprecated ARIA roles were not usedok
- aria-dialog-nameok
- `[aria-hidden="true"]` elements do not contain focusable descendentsok
- aria-input-field-nameok
- aria-meter-nameok
- aria-progressbar-nameok
- `[role]`s have all required `[aria-*]` attributesok
- Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required childrenok
- `[role]`s are contained by their required parent elementok
- `[role]` values are validok
- aria-textok
- aria-toggle-field-nameok
- aria-tooltip-nameok
- aria-treeitem-nameok
- bypassok
- definition-listok
- dlitemok
- duplicate-id-ariaok
- form-field-multiple-labelsok
- frame-titleok
- html-xml-lang-mismatchok
- input-button-nameok
- input-image-altok
- meta-refreshok
- object-altok
- select-nameok
- table-duplicate-nameok
- td-headers-attrok
- th-has-data-cellsok
- valid-langok
- video-captionok
- focusable-controlsok
- interactive-element-affordanceok
- logical-tab-orderok
- visual-order-follows-domok
- focus-trapsok
- managed-focusok
- use-landmarksok
- offscreen-content-hiddenok
- custom-controls-labelsok
- custom-controls-rolesok
- empty-headingok
- landmark-one-mainok
- label-content-name-mismatchok
- table-fake-captionok
- td-has-headerok

Performance section:
- First Contentful Painterror
Tested:
- https://optimizely.blog/

- Largest Contentful Painterror
Tested:
- https://optimizely.blog/

- Properly size imageserror
Tested:
- https://optimizely.blog/

- Reduce unused CSSerror
Tested:
- https://optimizely.blog/

- Reduce unused JavaScripterror
Tested:
- https://optimizely.blog/

- Preconnect to required originserror
Tested:
- https://optimizely.blog/

- Speed Indexwarning
Tested:
- https://optimizely.blog/

- Time to Interactivewarning
Tested:
- https://optimizely.blog/

- Serve images in next-gen formatswarning
Tested:
- https://optimizely.blog/

- Serve static assets with an efficient cache policywarning
Tested:
- https://optimizely.blog/

- Avoid an excessive DOM sizewarning
Tested:
- https://optimizely.blog/

- Image elements should have explicit `width` and `height`warning
Tested:
- https://optimizely.blog/

- Total Blocking Timeok
Tested:
- https://optimizely.blog/

- Cumulative Layout Shiftok
Tested:
- https://optimizely.blog/

- Max Potential First Input Delayok
Tested:
- https://optimizely.blog/

- Defer offscreen imagesok
Tested:
- https://optimizely.blog/

- Minify CSSok
Tested:
- https://optimizely.blog/

- Minify JavaScriptok
Tested:
- https://optimizely.blog/

- Efficiently encode imagesok
Tested:
- https://optimizely.blog/

- Enable text compressionok
Tested:
- https://optimizely.blog/

- Initial server response time was shortok
Tested:
- https://optimizely.blog/

- Avoid multiple page redirectsok
Tested:
- https://optimizely.blog/

- Use video formats for animated contentok
Tested:
- https://optimizely.blog/

- Remove duplicate modules in JavaScript bundlesok
Tested:
- https://optimizely.blog/

- Avoid serving legacy JavaScript to modern browsersok
Tested:
- https://optimizely.blog/

- Avoids enormous network payloadsok
Tested:
- https://optimizely.blog/

- critical-request-chainsok
Tested:
- https://optimizely.blog/

- JavaScript execution timeok
Tested:
- https://optimizely.blog/

- Minimizes main-thread workok
Tested:
- https://optimizely.blog/

- All text remains visible during webfont loadsok
Tested:
- https://optimizely.blog/

- third-party-summaryok
Tested:
- https://optimizely.blog/

- Uses passive listeners to improve scrolling performanceok
Tested:
- https://optimizely.blog/

- Javascript, avoids `document.write()ok
Tested:
- https://optimizely.blog/

- Has a <meta name="viewport"> tag with width or initial-scaleok
Tested:
- https://optimizely.blog/

- Network Requestsok
Tested:
- https://optimizely.blog/

- Network Round Trip Timesok
Tested:
- https://optimizely.blog/

- Server Backend Latenciesok
Tested:
- https://optimizely.blog/

- Main thread tasksok
Tested:
- https://optimizely.blog/

- Diagnosticsok
Tested:
- https://optimizely.blog/

- Metricsok
Tested:
- https://optimizely.blog/

- Screenshot Thumbnailsok
Tested:
- https://optimizely.blog/

- final-screenshotok
Tested:
- https://optimizely.blog/

- script-treemap-dataok
Tested:
- https://optimizely.blog/

- resource-summaryok
Tested:
- https://optimizely.blog/

- first-meaningful-paintok
- Eliminate render-blocking resourcesok
- prioritize-lcp-imageok
- user-timingsok
- third-party-facadesok
- Largest Contentful Paint elementok
- lcp-lazy-loadedok
- Avoid large layout shiftsok
- Avoids long main-thread tasksok
- non-composited-animationsok