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
tcpdf.org/fonts/fa-solid-900.woff2	0.0 ms	110.7 KiB
tcpdf.org/fonts/fa-brands-400.woff2	0.0 ms	99.0 KiB
tcpdf.org/css/combined.css	0.0 ms	21.5 KiB
/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy...	1209600.0 s	177.5 KiB
tcpdf.org/js/combined.js	0.0 ms	10.6 KiB
cse.google.com/cse.js?cx=partner-pub-2627887748647914%3a4304874910	0.0 ms	3.5 KiB
tcpdf.org/img/tcpdf_main_logo_150x30.png	0.0 ms	2.6 KiB
www.google.com/cse/static/style/look/v6/default.css	3000.0 s	1.2 KiB
/qoGBmLK-lHvVMjwHEzv8uytTsZ3i0TMQa7UEgGl7HFc1K4T3em7xxaGZ...	86400.0 s	789 B
pagead2.googlesyndication.com/pagead/osd.js?fcd=true	3600.0 s	76 B

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
tcpdf.org/fonts/fa-solid-900.woff2	335 ms
tcpdf.org/fonts/fa-brands-400.woff2	330 ms
/s/googlesymbols/v422/HhzZU5Ak9u-oMExPeInvcuEmPosC9zyteYE...	55 ms
/s/googlesans/v67/4Ua_rENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...	5.0 ms
/s/googlesans/v67/4Ua_rENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...	5.0 ms

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

items: [map[reflowTime:74.174 source:map[column:594 line:914 type:source-location url:https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js urlProvider:network]]]

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

items: [map[reflowTime:1.705 source:map[column:24 line:137 type:source-location url:https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js urlProvider:network]] map[reflowTime:8.481 source:map[column:206 line:136 type:source-location url:https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js urlProvider:network]] map[reflowTime:71.784 source:map[column:1830 line:155 type:source-location url:https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js urlProvider:network]] map[reflowTime:17.975 source:map[column:390 line:569 type:source-location url:https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js urlProvider:network]] map[reflowTime:56.199 source:map[column:415 line:439 type:source-location url:https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.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.

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

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
tcpdf.org/css/combined.css	21.5 KiB	600 ms

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

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 340 ms 2.8 KiB

URL	Transfer Size	Est Savings
www.google.com/cse/static/element/b33cba5881f68fbf/default_v6+en.css	9.7 KiB	2.8 KiB

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 170 ms 20.5 KiB

URL	Transfer Size	Est Savings
tcpdf.org/css/combined.css	21.4 KiB	20.5 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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.0 s 241.3 KiB

URL	Transfer Size	Est Savings
/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy...	177.5 KiB	105.6 KiB
/cse/static/element/b33cba5881f68fbf/cse_element__en.js?u...	98.5 KiB	48.8 KiB
/i/ca-pub-2627887748647914?href=https%3A%2F%2Ftcpdf.org&e...	68.7 KiB	33.5 KiB
cse.google.com/adsense/search/async-ads.js	43.3 KiB	33.4 KiB
/pagead/js/adsbygoogle.js?client=ca-pub-2627887748647914	54.2 KiB	20.0 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy...	1.5 s	703 ms	72 ms
/i/ca-pub-2627887748647914?href=https%3A%2F%2Ftcpdf.org&e...	393 ms	351 ms	34 ms
tcpdf.org/	382 ms	8.8 ms	1.3 ms
Unattributable	343 ms	14 ms	0.0 ms
/pagead/js/adsbygoogle.js?client=ca-pub-2627887748647914	327 ms	168 ms	19 ms
/cse/static/element/b33cba5881f68fbf/cse_element__en.js?u...	260 ms	141 ms	53 ms
/f/AGSKWxU5oXf8ZjeW5IhlenaaaYnewQbvIDsQQmUs9JeprsaC-zjqul...	227 ms	159 ms	7.6 ms
/f/AGSKWxXSRFNZ9PtmKUGkiFyvkILY0Bm_QTESFTS730AOgx4d_2lS17...	111 ms	88 ms	2.1 ms
/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads...	87 ms	12 ms	0.0 ms
ep2.adtrafficquality.google/sodar/sodar2.js	74 ms	66 ms	2.7 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	1.8 s
Style & Layout	1.1 s
Other	700 ms
Script Parsing & Compilation	211 ms
Rendering	135 ms
Parse HTML & CSS	113 ms

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Improve image delivery

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●Avoids enormous network payloads Total size was 1,798 KiB

●Avoid long main-thread tasks 14 long tasks found

●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 160 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 160 ms

●Avoid large layout shifts 2 layout shifts 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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Open Source PHP class for generating PDF documents `div#layout > div#main > div.header > h2`
tc-lib-pdf is the new generation of TCPDF for modern PHP. Generate production P… `div#layout > div#main > div.content > p`
tc-lib-pdf `div#main > div.content > p > strong`
TCPDF started in 2002 and became one of the most widely adopted PDF engines in … `div#layout > div#main > div.content > p`
tc-lib-pdf `div#main > div.content > p > code`
Install: `div#main > div.content > ul > li`
GitHub: https://github.com/tecnickcom/tc-lib-pdf `div#main > div.content > ul > li`
https://github.com/tecnickcom/tc-lib-pdf `div.content > ul > li > a`
API docs: /docs/srcdoc/tc-lib-pdf `div#main > div.content > ul > li`
/docs/srcdoc/tc-lib-pdf `div.content > ul > li > a`
Examples: /examples/ `div#main > div.content > ul > li`
/examples/ `div.content > ul > li > a`
Packagist: https://packagist.org/packages/tecnickcom/tc-lib-pdf `div#main > div.content > ul > li`
https://packagist.org/packages/tecnickcom/tc-lib-pdf `div.content > ul > li > a`
tc-lib-pdf is a deterministic, pure-PHP PDF toolkit with no external rendering … `div#layout > div#main > div.content > p`
tc-lib-pdf `div#main > div.content > p > code`
Modern baseline: PHP 8.1+, Composer-first, modular dependencies. `div#main > div.content > ul > li`
Modern baseline: `div.content > ul > li > strong`
Production features: advanced typography, graphics, security, standards, and fo… `div#main > div.content > ul > li`
Production features: `div.content > ul > li > strong`
Predictable output: deterministic generation suitable for invoices, reports, la… `div#main > div.content > ul > li`
Predictable output: `div.content > ul > li > strong`
Flexible adoption: use the full stack or install only the tc-lib packages your … `div#main > div.content > ul > li`
Flexible adoption: `div.content > ul > li > strong`
The legacy TCPDF repository is deprecated: `div#layout > div#main > div.content > p`
Legacy library: https://github.com/tecnickcom/TCPDF `div#main > div.content > ul > li`
https://github.com/tecnickcom/TCPDF `div.content > ul > li > a`
New library: https://github.com/tecnickcom/tc-lib-pdf `div#main > div.content > ul > li`
https://github.com/tecnickcom/tc-lib-pdf `ul > li > strong > a`
Recommendation: `div#main > div.content > p > strong`
Starting a new project: use tc-lib-pdf. `div#main > div.content > ul > li`
tc-lib-pdf `div.content > ul > li > strong`
Running legacy TCPDF in production: keep it stable short-term and plan phased m… `div#main > div.content > ul > li`
Migration matters because tc-lib-pdf is where active evolution continues. `div#layout > div#main > div.content > p`
PHP 8.1+ `div#main > div.content > ul > li`
Composer `div#main > div.content > ul > li`
Optional extensions: gd, zlib `div#main > div.content > ul > li`
gd `div.content > ul > li > code`
zlib `div.content > ul > li > code`
'/../vendor/tecnickcom/tc-lib-pdf-font/target/fonts' `code.language-php > span > span > span`
'helvetica' `code.language-php > span > span > span`
12 `code.language-php > span > span > span`
Invoices, receipts, and financial statements `div#main > div.content > ul > li`
Shipping labels and barcode-driven logistics documents `div#main > div.content > ul > li`
Compliance and archival PDFs (including PDF/A workflows) `div#main > div.content > ul > li`
Branded reports with custom fonts, SVG, and advanced layout controls `div#main > div.content > ul > li`
Interactive documents with forms, annotations, and signatures `div#main > div.content > ul > li`
Full UTF-8 Unicode and right-to-left language support `div#main > div.content > ul > li`
TrueTypeUnicode, OpenTypeUnicode v1, TrueType, OpenType v1, Type1, and CID-0 fo… `div#main > div.content > ul > li`
Font subsetting for smaller files `div#main > div.content > ul > li`
TeX-style language-aware hyphenation, optional zero-width breakpoints, and trac… `div#main > div.content > ul > li`
Text rendering modes: fill, stroke, and clipping `div#main > div.content > ul > li`
Automatic line breaks, page breaks, and justified text `div#main > div.content > ul > li`
Standard and custom page sizes, margins, and measurement units `div#main > div.content > ul > li`
HTML and CSS rendering `div#main > div.content > ul > li`
SVG rendering `div#main > div.content > ul > li`
Multi-column layouts and no-write page regions `div#main > div.content > ul > li`
Headers, footers, reusable page content, bookmarks, named destinations, and tab… `div#main > div.content > ul > li`
Automatic page numbering, page groups, page box control, and page reordering `div#main > div.content > ul > li`
Native JPEG, PNG, and SVG support `div#main > div.content > ul > li`
Extended image support through optional GD formats `div#main > div.content > ul > li`
Geometric drawing and 2D transformations `div#main > div.content > ul > li`
Linear/radial and mesh gradients, crop marks, and registration bars `div#main > div.content > ul > li`
ICC profiles, grayscale/RGB/CMYK/spot colors, transparency, and overprint contr… `div#main > div.content > ul > li`
Password and certificate-based encryption (RC4 and AES up to 256-bit) `div#main > div.content > ul > li`
Digital signatures: detached CMS (PKCS#7) signatures with configurable appearan… `div#main > div.content > ul > li`
RFC 3161 TSA timestamps embedded in CMS signatures with configurable digest, po… `div#main > div.content > ul > li`
LTV (Long-Term Validation) embedding in the same PDF revision: /DSS, /VRI, /OCS… `div#main > div.content > ul > li`
/DSS `div.content > ul > li > code`
/VRI `div.content > ul > li > code`
/OCSPs `div.content > ul > li > code`
/CRLs `div.content > ul > li > code`
/Certs `div.content > ul > li > code`
Rich annotations: links, notes, attachments, markup, widgets, and media `div#main > div.content > ul > li`
JavaScript embedding `div#main > div.content > ul > li`
PDF/A (1/2/3 with a/b/u conformance levels) and PDF/X support `div#main > div.content > ul > li`
1D and 2D barcodes through tc-lib-barcode `div#main > div.content > ul > li`
tc-lib-barcode `div.content > ul > li > code`
Interactive AcroForm fields `div#main > div.content > ul > li`
XObject templates and layers with visibility controls `div#main > div.content > ul > li`
Multiple output targets: browser display, download, file save, and MIME attachm… `div#main > div.content > ul > li`
Factur-X / ZUGFeRD workflows via embedded XML in PDF/A-3 `div#main > div.content > ul > li`
tc-lib-pdf is built on a set of focused, independently versioned packages. Each… `div#layout > div#main > div.content > p`
tc-lib-pdf `div#main > div.content > p > code`
tc-lib-pdf : Top-level PDF generation library; composes the full package stack. `div#main > div.content > ul > li`
tc-lib-pdf `div.content > ul > li > strong`
tc-lib-barcode : Generates 1D and 2D barcodes (QR, Data Matrix, Code 128, and … `div#main > div.content > ul > li`
tc-lib-barcode `ul > li > strong > a`
tc-lib-color : Color conversion and management across RGB, CMYK, HSL, and spot… `div#main > div.content > ul > li`
tc-lib-color `ul > li > strong > a`
tc-lib-file : File and data-URI helpers used internally for asset loading. `div#main > div.content > ul > li`
tc-lib-file `ul > li > strong > a`
tc-lib-unicode : Unicode string processing: bidirectional text, normalization,… `div#main > div.content > ul > li`
tc-lib-unicode `ul > li > strong > a`
tc-lib-unicode-data : Raw Unicode character data tables used by tc-lib-unicode. `div#main > div.content > ul > li`
tc-lib-unicode-data `ul > li > strong > a`
tc-lib-pdf-encrypt : PDF encryption: RC4 and AES (up to 256-bit), permissions,… `div#main > div.content > ul > li`
tc-lib-pdf-encrypt `ul > li > strong > a`
tc-lib-pdf-filter : PDF stream filters: FlateDecode, ASCII85, LZW, and others. `div#main > div.content > ul > li`
tc-lib-pdf-filter `ul > li > strong > a`
tc-lib-pdf-font : Font loading, subsetting, and embedding for all supported fo… `div#main > div.content > ul > li`
tc-lib-pdf-font `ul > li > strong > a`
tc-lib-pdf-graph : Vector graphics primitives: paths, transformations, gradien… `div#main > div.content > ul > li`
tc-lib-pdf-graph `ul > li > strong > a`
tc-lib-pdf-image : Image loading and embedding: JPEG, PNG, SVG, and GD-backed … `div#main > div.content > ul > li`
tc-lib-pdf-image `ul > li > strong > a`
tc-lib-pdf-page : Page geometry, margins, boxes, and page-level attributes. `div#main > div.content > ul > li`
tc-lib-pdf-page `ul > li > strong > a`
tc-lib-pdf-parser : Reads and parses existing PDF files for import or manipula… `div#main > div.content > ul > li`
tc-lib-pdf-parser `ul > li > strong > a`
Keep legacy TCPDF stable in production while planning migration. `div#main > div.content > ol > li`
Start new features on tc-lib-pdf. `div#main > div.content > ol > li`
tc-lib-pdf `div.content > ol > li > code`
Move legacy document flows incrementally: one template, one module, or one serv… `div#main > div.content > ol > li`
Validate outputs with your existing PDF regression checks. `div#main > div.content > ol > li`
Read the documentation `div#main > div.content > ul > li`
documentation `div.content > ul > li > a`
Explore examples `div#main > div.content > ul > li`
examples `div.content > ul > li > a`
/examples/007_example_signature_basic/ `div.content > ul > li > a`
/examples/008_example_signature_timestamp/ `div.content > ul > li > a`
/examples/009_example_signature_ltv/ `div.content > ul > li > a`
Browse project packages on /projects/ `div#main > div.content > ul > li`
/projects/ `div.content > ul > li > a`
View source and contribute on GitHub `div#main > div.content > ul > li`
GitHub `div.content > ul > li > a`
If this project helps your work, please consider supporting development via Pay… `div#layout > div#main > div.content > p`
PayPal `div#main > div.content > p > a`
© 2004-2026 – Nicola Asuni - Tecnick.com - All rights reserved. `body > div#layout > div.footerbar > span.copyright`
Nicola Asuni `div#layout > div.footerbar > span.copyright > a`
Tecnick.com `div#layout > div.footerbar > span.copyright > a`
about - disclaimer - privacy `div#layout > div.footerbar > span.copyright > a`

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
/projects/ `div.content > ul > li > a`
GitHub `div.content > ul > li > a`
PayPal `div#main > div.content > p > a`

These are opportunities to improve the legibility of your content.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > div#layout > a#menuLink `body > div#layout > a#menuLink`

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.

Best practices

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-*]` 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

●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.

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

●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

●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

●Deprecated ARIA roles were not used

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○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

○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

○`<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.

○Identical links have the same purpose.

○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

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Displayed size	Actual size	Expected size
TCPDF `div#layout > div#menu > a.pure-menu-heading > img`	tcpdf.org/img/tcpdf_main_logo_150x30.png	150 x 30	150 x 30	225 x 45

●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

●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

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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`