Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
www.random.org/graphics/nuvola/learn.png	14400.0 s	11.0 KiB
www.random.org/graphics/nuvola/graph.png	14400.0 s	7.9 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB
www.random.org/graphics/nuvola/help.gif	14400.0 s	5.8 KiB
www.random.org/graphics/rdo-logo-300x44.png	14400.0 s	4.2 KiB
www.random.org/js/random.js	14400.0 s	2.1 KiB
www.random.org/css/style.css	14400.0 s	2.0 KiB
www.random.org/css/mobile-style.css	14400.0 s	1003 B
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	0 B

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

value: No additional origins are good candidates for preconnecting

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
www.random.org/css/mobile-style.css	1003 B
www.random.org/css/style.css	2.0 KiB
www.random.org/js/random.js	2.1 KiB	150 ms

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 802 ms

URL	Time Spent
random.org/	802 ms
www.random.org/	0.0 ms

●Layout shift culprits

●Optimize DOM size

●Font display

●Forced reflow

●Improve image delivery

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 1.6 s

●Max Potential First Input Delay 20 ms

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 56 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.3 s

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 20 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 50 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

○Avoid large layout shifts

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Search RANDOM.ORG `div#invisible > div#search > form > div`
What's this fuss about true randomness? `body > div#invisible > div#homepage-wide-column > h2`
true `div#invisible > div#homepage-wide-column > h2 > em`
Prof. Mads Haahr `div#invisible > div#homepage-wide-column > p > a`
School of Computer Science and Statistics `div#invisible > div#homepage-wide-column > p > a`
Trinity College, Dublin `div#invisible > div#homepage-wide-column > p > a`
Randomness and Integrity Services Ltd `div#invisible > div#homepage-wide-column > p > a`
Games and Lotteries `div > div.mainindent > h3 > a`
Lottery Quick Pick `div > div.mainindent > p > a`
Keno Quick Pick `div > div.mainindent > p > a`
Coin Flipper `div > div.mainindent > p > a`
Dice Roller `div > div.mainindent > p > a`
Playing Card Shuffler `div > div.mainindent > p > a`
Birdie Fund Generator `div > div.mainindent > p > a`
Random Drawings `div > div.mainindent > h3 > a`
Q3.1 in the FAQ `div > div.mainindent > p > a`
Third-Party Draw Service `div > div.mainindent > p > a`
Step by Step Guide `div > div.mainindent > p > a`
Step by Step Video `div > div.mainindent > p > a`
Price Calculator `div > div.mainindent > p > a`
Drawing FAQ `div > div.mainindent > p > a`
Public Records `div > div.mainindent > p > a`
Drawing Result Widget `div > div.mainindent > p > a`
Multi-Round Giveaway Service `div > div.mainindent > p > a`
Numbers `div > div.mainindent > h3 > a`
Integer Generator `div > div.mainindent > p > a`
Sequence Generator `div > div.mainindent > p > a`
Integer Set Generator `div > div.mainindent > p > a`
Gaussian Generator `div > div.mainindent > p > a`
Decimal Fraction Generator `div > div.mainindent > p > a`
Raw Random Bytes `div > div.mainindent > p > a`
Lists and Strings and Maps, Oh My! `div > div.mainindent > h3 > a`
List Randomizer `div > div.mainindent > p > a`
String Generator `div > div.mainindent > p > a`
Password Generator `div > div.mainindent > p > a`
Clock Time Generator `div > div.mainindent > p > a`
Calendar Date Generator `div > div.mainindent > p > a`
Geographic Coordinate Generator `div > div.mainindent > p > a`
Bitmaps `div > div.mainindent > p > a`
Hexadecimal Color Code Generator `div > div.mainindent > p > a`
Pregenerated Files `div > div.mainindent > p > a`
Pure White Audio Noise `div > div.mainindent > p > a`
Jazz Scales `div > div.mainindent > p > a`
Samuel Beckett `div > div.mainindent > p > a`
DNA Protein Sequence Randomizer `div > div.mainindent > p > a`
Web Tools and Widgets for Your Pages `div > div.mainindent > h3 > a`
Integer Widget Wizard `div > div.mainindent > p > a`
Draw Widget Wizard `div > div.mainindent > p > a`
HTTP API `div > div.mainindent > p > a`
Guidelines `div > div.mainindent > p > a`
Banned Hosts `div > div.mainindent > p > a`
Learn about Randomness `div > div.mainindent > h3 > a`
Introduction to Randomness `div > div.mainindent > p > a`
History `div > div.mainindent > p > a`
Many Testimonials `div > div.mainindent > p > a`
Acknowledgements `div > div.mainindent > p > a`
Quotations `div > div.mainindent > p > a`
Media Coverage and Scientific Citations `div > div.mainindent > p > a`
News `div > div.mainindent > p > a`
Statistics `div > div.mainindent > h3 > a`
Real-Time Statistics `div > div.mainindent > p > a`
Statistical Analysis `div > div.mainindent > p > a`
Bit Tally `div > div.mainindent > p > a`
Your Quota `div > div.mainindent > p > a`
Contact and Help `div#invisible > div > div.mainindent > h3`
FAQ `div > div.mainindent > p > a`
Newsletter `div > div.mainindent > p > a`
Contact Details `div > div.mainindent > p > a`
BlueSky `div#invisible > div > div > a`
Terms and Conditions `div#invisible > div > div > a`
About Us `div#invisible > div > div > a`

These are opportunities to improve the legibility of your content.

Names and labels

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#search > form > div > input `div#search > form > div > input`

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > div#invisible > div#homepage-generator > iframe `body > div#invisible > div#homepage-generator > iframe`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Internationalization and localization

If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These are opportunities to improve the interpretation of your content by users in different locales.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Home `div#invisible > ul#navigation > li > a.active`
Games `div#invisible > ul#navigation > li > a`
Numbers `div#invisible > ul#navigation > li > a`
Lists & More `div#invisible > ul#navigation > li > a`
Drawings `div#invisible > ul#navigation > li > a`
Web Tools `div#invisible > ul#navigation > li > a`
Statistics `div#invisible > ul#navigation > li > a`
Testimonials `div#invisible > ul#navigation > li > a`
Learn More `div#invisible > ul#navigation > li > a`
Login `div#invisible > ul#navigation > li > a`
Terms and Conditions `div#invisible > div > div > a`
About Us `div#invisible > div > div > a`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These items highlight common accessibility best practices.

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

●Input buttons have discernible text.

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

●Document has a `<title>` element

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

●Links are distinguishable without relying on color.

●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

●Heading elements appear in a sequentially-descending order

○`[accesskey]` values are unique

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

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

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

○Deprecated ARIA roles were not used

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

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements use only permitted ARIA attributes

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

○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

○`[role]` values are valid

○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

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

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

○Buttons have an accessible name

○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

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

○Image elements have `[alt]` attributes

○`<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.

○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.

○Identical links have the same purpose.

○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.

Best Practices

Browser Compatibility

Specifying a doctype prevents the browser from switching to quirks-mode. Learn more about the doctype declaration.

Why this matters

Performance issues directly impact user engagement and conversion rates.

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
www.random.org/ line 457, col 6	`ReferenceError: $ is not defined at https://www.random.org/:458:7`

●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

●Properly defines charset

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

●Ensure CSP is effective against XSS attacks

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

100

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.

○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 have descriptive text

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

○Image elements have `[alt]` attributes

○Document has a valid `rel=canonical`