C — https://www.ocaml.org | BeaverCheck Audit

Site Health

Score: 74 / 100

Based on 8 categories, 0 sections

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

Top Priorities (5)

Content-Security-Policy header is missing

Security › Security Headers

HSTS header is missing

Security › Security Headers

No Content-Security-Policy header found

Security › Content Security Policy

1 button(s) with no accessible text

Accessibility › Link & Button Quality

Soft 404: server returns HTTP 200 for non-existent pages

Accessibility › 404 Error Page

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[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fwww.ocaml.org)](https://beavercheck.com/results/6c92957d-fbff-6e55-bab2-85bffd362886)

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

100

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

6.98 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

7.92 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

194 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

6.98 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

7.92 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:12.029 source:map[column:7507 line:12 type:source-location url:https://ocaml.org/_/ZDJiMGNkNGMzMjBlYjNmZGUxNTMxOTAyNjA0MDU2N2Q/vendors/swiper-bundle.min.js urlProvider:network]] map[reflowTime:71.594 source:map[column:16832 line:12 type:source-location url:https://ocaml.org/_/ZDJiMGNkNGMzMjBlYjNmZGUxNTMxOTAyNjA0MDU2N2Q/vendors/swiper-bundle.min.js urlProvider:network]]]

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

URL	Transfer Size	Duration
/_/ZDJiMGNkNGMzMjBlYjNmZGUxNTMxOTAyNjA0MDU2N2Q/vendors/sw...	42.0 KiB	150 ms
/_/NmFjYjY5ZmIxYWRhMWQxMTQxODM4ZDEwYTgwMDcwNmI/vendors/fo...	1.0 KiB
/_/YmM5NjJlN2E4YzVkMDBmMDQ2ODEwNTQyNTBkNzE2MmM/vendors/sw...	5.3 KiB
ocaml.org/_/ZDBlYzBjZTdmOGJmMGE2YmY3YjNmOGNkNGZkMmQ5ZWU/css/main.css	23.0 KiB	150 ms
/_/YjM3OGY4YzIwN2E2ZmUxZTczOWVkNDQwZWRhMDU0MGM/vendors/fo...	420 B

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Request	Cache TTL	Transfer Size
ocaml.org/img/innertopbg.png	86400.0 s	16.8 KiB
ocaml.org/img/innerbottombg.png	86400.0 s	16.4 KiB
ocaml.org/img/acm_award_banner/acm_award_banner.svg	86400.0 s	569 B

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	/_/YjEyNTk1YjM2ZmIyMWFlNGFlYTM2MTAxYWQ1NDU1Yzg/img/home/e...	480.5 KiB	462.7 KiB
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/ZDkzZDYxMDlmMmZjMTdhNjdhNTBhMTg4MTE1ZjFjMGI/img/home/vim-preview.png	390.6 KiB	370.9 KiB
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	/_/YzA5ZWY4OTQ5Mjc1NjA4MmQ3NzAyNThmMWJmZmZlZTE/img/home/v...	150.7 KiB	141.9 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Estimated savings: 751 ms

URL	Time Spent
www.ocaml.org/	751 ms
ocaml.org/	0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Estimated savings: 150 ms 19.3 KiB

URL	Transfer Size	Est Savings
ocaml.org/_/ZDBlYzBjZTdmOGJmMGE2YmY3YjNmOGNkNGZkMmQ5ZWU/css/main.css	22.8 KiB	19.3 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Estimated savings: 70 ms 24.8 KiB

URL	Transfer Size	Est Savings
/_/ZDJiMGNkNGMzMjBlYjNmZGUxNTMxOTAyNjA0MDU2N2Q/vendors/sw...	41.8 KiB	24.8 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

	URL
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	/_/YzA5ZWY4OTQ5Mjc1NjA4MmQ3NzAyNThmMWJmZmZlZTE/img/home/v...
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	/_/YzA5ZWY4OTQ5Mjc1NjA4MmQ3NzAyNThmMWJmZmZlZTE/img/home/v...
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	/_/YzA5ZWY4OTQ5Mjc1NjA4MmQ3NzAyNThmMWJmZmZlZTE/img/home/v...
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/ZDkzZDYxMDlmMmZjMTdhNjdhNTBhMTg4MTE1ZjFjMGI/img/home/vim-preview.png
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	/_/YjEyNTk1YjM2ZmIyMWFlNGFlYTM2MTAxYWQ1NDU1Yzg/img/home/e...
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/ZDkzZDYxMDlmMmZjMTdhNjdhNTBhMTg4MTE1ZjFjMGI/img/home/vim-preview.png
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	/_/YjEyNTk1YjM2ZmIyMWFlNGFlYTM2MTAxYWQ1NDU1Yzg/img/home/e...
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/ZDkzZDYxMDlmMmZjMTdhNjdhNTBhMTg4MTE1ZjFjMGI/img/home/vim-preview.png
div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	/_/YjEyNTk1YjM2ZmIyMWFlNGFlYTM2MTAxYWQ1NDU1Yzg/img/home/e...
An example OCaml program defining nested lists in OCaml. A terminal output also… `div.pt-4 > div.flex > div.lg:flex-1 > img`	ocaml.org/_/ZTM4NWExMjJiZjAwZjEzMWY5MTNjYjZiZjNhNTFiODc/img/home/safe-stable.svg
Vim `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/MzEyZWI2NmFiMWY4ZGEwZmRkMDcxYTgzNzU5NjM5NzA/logos/vim.svg
Vim `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/MzEyZWI2NmFiMWY4ZGEwZmRkMDcxYTgzNzU5NjM5NzA/logos/vim.svg
Vim `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/MzEyZWI2NmFiMWY4ZGEwZmRkMDcxYTgzNzU5NjM5NzA/logos/vim.svg
div.pt-4 > div.flex > div.lg:flex-1 > img `div.pt-4 > div.flex > div.lg:flex-1 > img`	ocaml.org/_/ZWVmZmU2MzczN2FjZTk2OGE5MDViNTdmMmNmNmQwMTA/img/home/workfaster.svg
Docker `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/OGNjZjBhMjg4MjQ2NDlmMWNiODE0ZGJjYjM5YzhiMmU/logos/docker.svg
Ahrefs `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/MjcxNDQ0ZThiMDY2NjA0Y2ExNWRmZTRiOTQ2Y2M5ZWQ/logos/ahrefs.svg
illustration of a cup `div.container-fluid > div.text-center > div.md:w-60 > img.mx-auto`	/_/NDBkZDQ2N2U3Y2VmM2I1NWZkNTk0NWJjOTNjNGYyYmE/img/acm_aw...
Microsoft `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/ODdlNDViNTBkNGY4YjFiNzBkY2E2ZTA5OTQwMmJiMWY/logos/microsoft.svg
Bloomberg `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/ZGJiYTQ0NTA0MjQyMDIzMGU2YTJjZDFiNDAxY2E5YjA/logos/bloomberg.svg
VS Code `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/YTgwYjYyMzhlYzQwNTRhNmRlMzJkNTZmMDk3YWM2NTY/logos/vscode.svg
VS Code `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/YTgwYjYyMzhlYzQwNTRhNmRlMzJkNTZmMDk3YWM2NTY/logos/vscode.svg
VS Code `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/YTgwYjYyMzhlYzQwNTRhNmRlMzJkNTZmMDk3YWM2NTY/logos/vscode.svg
OCaml logo `ul.order-0 > li > a.block > img.dark:hidden`	ocaml.org/_/MDBjN2M4YjIxY2Y1YWExZWE3Njk4M2FiZTg1NWZjNTM/logo-with-name.svg
OCaml `div.mx-auto > div.flex > a > img.h-8`	ocaml.org/_/MDBjN2M4YjIxY2Y1YWExZWE3Njk4M2FiZTg1NWZjNTM/logo-with-name.svg
Jane Street `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/Mzc0OTY1YzIzYWI2YmJkMzVlNGUzNThiNDM0ZGRlNDI/logos/janestreet.svg
Tezos `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/ZGVjYTI0ZGJjNzYzZmRlZGQ3OWI0MjgxYTUyZGFmZjU/logos/tezos.svg
Emacs `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/NjBkMWJkNDgzZjAwMTQ4MjlmYjUyN2Q1ZDMwZDAxMzk/logos/emacs.svg
Emacs `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/NjBkMWJkNDgzZjAwMTQ4MjlmYjUyN2Q1ZDMwZDAxMzk/logos/emacs.svg
Emacs `div#swiper-wrapper-8e8f1fbad333e12d > div.swiper-slide > div > img`	ocaml.org/_/NjBkMWJkNDgzZjAwMTQ4MjlmYjUyN2Q1ZDMwZDAxMzk/logos/emacs.svg
Facebook `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/OGI2M2JmY2NkYzQ0NzNjNTRhNGQ3ZDhiZTQyMjhjNTY/logos/facebook.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 2,323 KiB

●JavaScript execution time 0.2 s

●Minimizes main-thread work 1.1 s

●Avoid long main-thread tasks 3 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 80 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 20 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid non-composited animations

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Failing Elements
val square : int -> int = < fun > `pre#output > code > span > i.text-content`
- : int = 9 `pre#output > code > span > i.text-content`
val factorial : int -> int = < fun > `pre#output > code > span > i.text-content`
- : int = 120 `pre#output > code > span > i.text-content`
- : int = 14400 `pre#output > code > span > i.text-content`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Failing Elements
Success Stories `div.container-fluid > div.text-center > div.text-content > a.text-primary`

These are opportunities to improve the legibility of your content.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○No element has a `[tabindex]` value greater than 0

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Detected JavaScript libraries

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Link destination	Link Text
ocaml.org/news/sigplan_announcement	Read more
ocaml.org/academic-users	Learn more
ocaml.org/industrial-users	Learn more

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

100

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

551 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.49 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.009

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

747 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.50 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:12.681 source:map[column:7507 line:12 type:source-location url:https://ocaml.org/_/ZDJiMGNkNGMzMjBlYjNmZGUxNTMxOTAyNjA0MDU2N2Q/vendors/swiper-bundle.min.js urlProvider:network]] map[reflowTime:26.552 source:map[column:16832 line:12 type:source-location url:https://ocaml.org/_/ZDJiMGNkNGMzMjBlYjNmZGUxNTMxOTAyNjA0MDU2N2Q/vendors/swiper-bundle.min.js urlProvider:network]]]

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Request	Cache TTL	Transfer Size
ocaml.org/img/innertopbg.png	86400.0 s	16.8 KiB
ocaml.org/img/innerbottombg.png	86400.0 s	16.4 KiB
ocaml.org/img/acm_award_banner/acm_award_banner.svg	86400.0 s	569 B

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	/_/YjEyNTk1YjM2ZmIyMWFlNGFlYTM2MTAxYWQ1NDU1Yzg/img/home/e...	480.5 KiB	442.4 KiB
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/ZDkzZDYxMDlmMmZjMTdhNjdhNTBhMTg4MTE1ZjFjMGI/img/home/vim-preview.png	390.6 KiB	350.6 KiB
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	/_/YzA5ZWY4OTQ5Mjc1NjA4MmQ3NzAyNThmMWJmZmZlZTE/img/home/v...	150.7 KiB	131.0 KiB

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

URL	Transfer Size
/_/ZDJiMGNkNGMzMjBlYjNmZGUxNTMxOTAyNjA0MDU2N2Q/vendors/sw...	42.0 KiB
/_/YjM3OGY4YzIwN2E2ZmUxZTczOWVkNDQwZWRhMDU0MGM/vendors/fo...	420 B
/_/YmM5NjJlN2E4YzVkMDBmMDQ2ODEwNTQyNTBkNzE2MmM/vendors/sw...	5.3 KiB
ocaml.org/_/ZDBlYzBjZTdmOGJmMGE2YmY3YjNmOGNkNGZkMmQ5ZWU/css/main.css	23.0 KiB
/_/NmFjYjY5ZmIxYWRhMWQxMTQxODM4ZDEwYTgwMDcwNmI/vendors/fo...	1.0 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Estimated savings: 40 ms 18.4 KiB

URL	Transfer Size	Est Savings
ocaml.org/_/ZDBlYzBjZTdmOGJmMGE2YmY3YjNmOGNkNGZkMmQ5ZWU/css/main.css	22.8 KiB	18.4 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Estimated savings: 40 ms 24.8 KiB

URL	Transfer Size	Est Savings
/_/ZDJiMGNkNGMzMjBlYjNmZGUxNTMxOTAyNjA0MDU2N2Q/vendors/sw...	41.8 KiB	24.8 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

	URL
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	/_/YzA5ZWY4OTQ5Mjc1NjA4MmQ3NzAyNThmMWJmZmZlZTE/img/home/v...
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	/_/YzA5ZWY4OTQ5Mjc1NjA4MmQ3NzAyNThmMWJmZmZlZTE/img/home/v...
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	/_/YzA5ZWY4OTQ5Mjc1NjA4MmQ3NzAyNThmMWJmZmZlZTE/img/home/v...
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/ZDkzZDYxMDlmMmZjMTdhNjdhNTBhMTg4MTE1ZjFjMGI/img/home/vim-preview.png
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	/_/YjEyNTk1YjM2ZmIyMWFlNGFlYTM2MTAxYWQ1NDU1Yzg/img/home/e...
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/ZDkzZDYxMDlmMmZjMTdhNjdhNTBhMTg4MTE1ZjFjMGI/img/home/vim-preview.png
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	/_/YjEyNTk1YjM2ZmIyMWFlNGFlYTM2MTAxYWQ1NDU1Yzg/img/home/e...
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/ZDkzZDYxMDlmMmZjMTdhNjdhNTBhMTg4MTE1ZjFjMGI/img/home/vim-preview.png
div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	/_/YjEyNTk1YjM2ZmIyMWFlNGFlYTM2MTAxYWQ1NDU1Yzg/img/home/e...
An example OCaml program defining nested lists in OCaml. A terminal output also… `div.pt-4 > div.flex > div.lg:flex-1 > img`	ocaml.org/_/ZTM4NWExMjJiZjAwZjEzMWY5MTNjYjZiZjNhNTFiODc/img/home/safe-stable.svg
Vim `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/MzEyZWI2NmFiMWY4ZGEwZmRkMDcxYTgzNzU5NjM5NzA/logos/vim.svg
Vim `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/MzEyZWI2NmFiMWY4ZGEwZmRkMDcxYTgzNzU5NjM5NzA/logos/vim.svg
Vim `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/MzEyZWI2NmFiMWY4ZGEwZmRkMDcxYTgzNzU5NjM5NzA/logos/vim.svg
div.pt-4 > div.flex > div.lg:flex-1 > img `div.pt-4 > div.flex > div.lg:flex-1 > img`	ocaml.org/_/ZWVmZmU2MzczN2FjZTk2OGE5MDViNTdmMmNmNmQwMTA/img/home/workfaster.svg
Docker `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/OGNjZjBhMjg4MjQ2NDlmMWNiODE0ZGJjYjM5YzhiMmU/logos/docker.svg
Ahrefs `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/MjcxNDQ0ZThiMDY2NjA0Y2ExNWRmZTRiOTQ2Y2M5ZWQ/logos/ahrefs.svg
illustration of a cup `div.container-fluid > div.text-center > div.md:w-60 > img.mx-auto`	/_/NDBkZDQ2N2U3Y2VmM2I1NWZkNTk0NWJjOTNjNGYyYmE/img/acm_aw...
Microsoft `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/ODdlNDViNTBkNGY4YjFiNzBkY2E2ZTA5OTQwMmJiMWY/logos/microsoft.svg
Bloomberg `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/ZGJiYTQ0NTA0MjQyMDIzMGU2YTJjZDFiNDAxY2E5YjA/logos/bloomberg.svg
VS Code `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/YTgwYjYyMzhlYzQwNTRhNmRlMzJkNTZmMDk3YWM2NTY/logos/vscode.svg
VS Code `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/YTgwYjYyMzhlYzQwNTRhNmRlMzJkNTZmMDk3YWM2NTY/logos/vscode.svg
VS Code `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/YTgwYjYyMzhlYzQwNTRhNmRlMzJkNTZmMDk3YWM2NTY/logos/vscode.svg
OCaml logo `ul.order-0 > li > a.block > img.dark:hidden`	ocaml.org/_/MDBjN2M4YjIxY2Y1YWExZWE3Njk4M2FiZTg1NWZjNTM/logo-with-name.svg
OCaml `div.mx-auto > div.flex > a > img.h-8`	ocaml.org/_/MDBjN2M4YjIxY2Y1YWExZWE3Njk4M2FiZTg1NWZjNTM/logo-with-name.svg
Jane Street `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/Mzc0OTY1YzIzYWI2YmJkMzVlNGUzNThiNDM0ZGRlNDI/logos/janestreet.svg
illustration of a cup `div.space-y-6 > div.inline-flex > div.hidden > img.ml-auto`	/_/MWI2MzIxNGY1MGU1YjI5YWEzMzE5N2NkZjYxOTk2OWE/img/acm_aw...
Tezos `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/ZGVjYTI0ZGJjNzYzZmRlZGQ3OWI0MjgxYTUyZGFmZjU/logos/tezos.svg
Emacs `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/NjBkMWJkNDgzZjAwMTQ4MjlmYjUyN2Q1ZDMwZDAxMzk/logos/emacs.svg
Emacs `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/NjBkMWJkNDgzZjAwMTQ4MjlmYjUyN2Q1ZDMwZDAxMzk/logos/emacs.svg
Emacs `div#swiper-wrapper-831e1a4b10c3d5dbf > div.swiper-slide > div > img`	ocaml.org/_/NjBkMWJkNDgzZjAwMTQ4MjlmYjUyN2Q1ZDMwZDAxMzk/logos/emacs.svg
Facebook `div.text-center > div.flex > div.mx-8 > img.h-8`	ocaml.org/_/OGI2M2JmY2NkYzQ0NzNjNTRhNGQ3ZDhiZTQyMjhjNTY/logos/facebook.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Estimated savings: 203 ms

URL	Time Spent
www.ocaml.org/	203 ms
ocaml.org/	0.0 ms

●Time to Interactive 1.5 s

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 30 ms

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 2,323 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.3 s

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 10 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 20 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

Accessibility

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Failing Elements
Get Started `nav.container-fluid > ul.order-3 > li > a.border`
val square : int -> int = < fun > `pre#output > code > span > i.text-content`
- : int = 9 `pre#output > code > span > i.text-content`
val factorial : int -> int = < fun > `pre#output > code > span > i.text-content`
- : int = 120 `pre#output > code > span > i.text-content`
- : int = 14400 `pre#output > code > span > i.text-content`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Failing Elements
Success Stories `div.container-fluid > div.text-center > div.text-content > a.text-primary`

These are opportunities to improve the legibility of your content.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Detected JavaScript libraries

SEO

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Link destination	Link Text
ocaml.org/news/sigplan_announcement	Read more
ocaml.org/academic-users	Learn more
ocaml.org/industrial-users	Learn more

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Browse & Analyze

Learn

Results for https://www.ocaml.org

Site Health

Top Priorities (5)

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Contrast

Best Practices

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Contrast

Best Practices

SEO

Content Best Practices

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