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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

93

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.

RequestCache TTLTransfer Size
boe.es/imagenes/logoMPR.svg0.0 ms177.8 KiB
boe.es/imagenes/logoMPRmovil.svg0.0 ms137.5 KiB
boe.es/imagenes/home/europa.jpg0.0 ms57.6 KiB
boe.es/imagenes/home/bl-01_full.jpg0.0 ms52.9 KiB
boe.es/imagenes/home/boe-01.jpg0.0 ms51.8 KiB
boe.es/imagenes/home/bl-01.jpg0.0 ms48.6 KiB
boe.es/estilos/boe.css0.0 ms38.4 KiB
boe.es/imagenes/home/brm-01.jpg0.0 ms36.4 KiB
boe.es/imagenes/home/bj-01_full.jpg0.0 ms30.0 KiB
boe.es/imagenes/home/bj-01.jpg0.0 ms28.8 KiB
boe.es/imagenes/logoBlanco128.png0.0 ms20.0 KiB
boe.es/imagenes/logoBOE.svg0.0 ms17.5 KiB
boe.es/estilos/home.css0.0 ms10.6 KiB
boe.es/imagenes/home/datos_abiertos_mono.svg0.0 ms9.3 KiB
boe.es/imagenes/home/teju_270.svg0.0 ms6.8 KiB
boe.es/js/desplegable.js0.0 ms5.4 KiB
boe.es/imagenes/home/teu_270.svg0.0 ms3.9 KiB
boe.es/imagenes/home/subastas_270.svg0.0 ms2.7 KiB
boe.es/imagenes/home/youtube_32.svg0.0 ms2.2 KiB
boe.es/imagenes/home/anunciantes.svg0.0 ms2.0 KiB
boe.es/imagenes/logoBuscar.svg0.0 ms1.9 KiB
boe.es/imagenes/home/rss_32.svg0.0 ms1.9 KiB
boe.es/imagenes/home/linkedin_32.svg0.0 ms1.8 KiB
boe.es/imagenes/home/twitter_32.svg0.0 ms1.6 KiB
boe.es/imagenes/home/facebook_32.svg0.0 ms1.5 KiB
boe.es/imagenes/logoMiBOE.svg0.0 ms1.5 KiB
boe.es/imagenes/ico_bullet.svg0.0 ms1.5 KiB
boe.es/imagenes/home/lupa_24x24.png0.0 ms1.4 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Agencia Estatal Boletín Oficial del Estado div.menu-wrapper > div#logo-movil-boe-container > a > img
boe.es/imagenes/logoBlanco128.png19.2 KiB18.0 KiB
Otros diarios oficiales Otros diarios oficiales Unión Europea (DOUE) Boletines … div#contenedor-secundario > div#diarios > div.fila > div.elemento
boe.es/imagenes/home/europa.jpg56.8 KiB17.7 KiB
Todo el Derecho Todo el Derecho Legislación Tribunal Constitucional Jurispruden… div#contenedor-secundario > div#juridico > div.fila > div#todo-el-derecho
boe.es/imagenes/home/bl-01_full.jpg52.2 KiB13.1 KiB
Boletín Oficial del Estado Boletín Oficial del Estado Último BOE Buscar en BOE … div#diarios > div.fila > div.elemento-doble > div.elemento
boe.es/imagenes/home/boe-01.jpg51.0 KiB11.9 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-1-DIV
nodeLabel: Otros diarios oficiales Otros diarios oficiales Unión Europea (DOUE) Boletines …
path: 1,HTML,1,BODY,4,DIV,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV
selector: div#contenedor-secundario > div#diarios > div.fila > div.elemento
snippet: <div class="elemento">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
boe.es/http/1.1
boe.es/estilos/boe.csshttp/1.1
boe.es/estilos/home.csshttp/1.1
boe.es/imagenes/logoMPRmovil.svghttp/1.1
boe.es/imagenes/logoMPR.svghttp/1.1
boe.es/imagenes/logoBOE.svghttp/1.1
boe.es/imagenes/logoBlanco128.pnghttp/1.1
boe.es/imagenes/logoBuscar.svghttp/1.1
boe.es/imagenes/logoMiBOE.svghttp/1.1
boe.es/imagenes/home/boe-01.jpghttp/1.1
boe.es/imagenes/home/brm-01.jpghttp/1.1
boe.es/imagenes/home/europa.jpghttp/1.1
boe.es/imagenes/home/bl-01.jpghttp/1.1
boe.es/imagenes/home/bl-01_full.jpghttp/1.1
boe.es/imagenes/home/bj-01.jpghttp/1.1
boe.es/imagenes/home/bj-01_full.jpghttp/1.1
boe.es/imagenes/home/teu_270.svghttp/1.1
boe.es/imagenes/home/teju_270.svghttp/1.1
boe.es/imagenes/home/subastas_270.svghttp/1.1
boe.es/imagenes/home/anunciantes.svghttp/1.1
boe.es/imagenes/home/datos_abiertos_mono.svghttp/1.1
boe.es/imagenes/home/rss_32.svghttp/1.1
boe.es/imagenes/home/twitter_32.svghttp/1.1
boe.es/imagenes/home/facebook_32.svghttp/1.1
boe.es/imagenes/home/linkedin_32.svghttp/1.1
boe.es/imagenes/home/youtube_32.svghttp/1.1
boe.es/js/desplegable.jshttp/1.1
boe.es/imagenes/ico_bullet.svghttp/1.1
boe.es/imagenes/home/lupa_24x24.pnghttp/1.1
boe.es/favicon.icohttp/1.1

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.

URLTransfer SizeDuration
boe.es/estilos/home.css10.6 KiB451 ms
boe.es/estilos/boe.css38.4 KiB451 ms

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.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 150 ms 29.8 KiB
URLTransfer SizeEst Savings
boe.es/estilos/boe.css37.6 KiB29.8 KiB

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: 0.0 ms 7.8 KiB
URLTransfer SizeEst Savings
boe.es/estilos/boe.css38.4 KiB7.8 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.0 KiB
URLTransfer SizeEst Savings
boe.es/js/desplegable.js4.6 KiB2.0 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Agencia Estatal Boletín Oficial del Estado div.menu-wrapper > div#logo-movil-boe-container > a > img
boe.es/imagenes/logoBlanco128.png
div#notificaciones_boe > div.contenedor-lista > a > img div#notificaciones_boe > div.contenedor-lista > a > img
boe.es/imagenes/home/teu_270.svg
div#edictos_judiciales_boe > div.contenedor-lista > a > img div#edictos_judiciales_boe > div.contenedor-lista > a > img
boe.es/imagenes/home/teju_270.svg
div#subastas > div.contenedor-lista > a > img div#subastas > div.contenedor-lista > a > img
boe.es/imagenes/home/subastas_270.svg
div#anunciantes > div.contenedor-lista > a.servicio-gestion-enlace > img div#anunciantes > div.contenedor-lista > a.servicio-gestion-enlace > img
boe.es/imagenes/home/anunciantes.svg
div#datosabiertos > div.contenedor-lista > a.servicio-gestion-enlace > img div#datosabiertos > div.contenedor-lista > a.servicio-gestion-enlace > img
boe.es/imagenes/home/datos_abiertos_mono.svg
RSS li > div.enlace > a > img
boe.es/imagenes/home/rss_32.svg
X li > div.enlace > a > img
boe.es/imagenes/home/twitter_32.svg
Facebook li > div.enlace > a > img
boe.es/imagenes/home/facebook_32.svg
LinkedIn li > div.enlace > a > img
boe.es/imagenes/home/linkedin_32.svg
YouTube li > div.enlace > a > img
boe.es/imagenes/home/youtube_32.svg
Buscar ul.menu > li.menu-item > a > img
boe.es/imagenes/logoBuscar.svg
Mi BOE ul.menu > li.menu-item > a > img
boe.es/imagenes/logoMiBOE.svg

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

●Time to Interactive 3.2 s
●Layout shift culprits
●Optimize DOM size
●Font display
●Forced reflow
●LCP breakdown
●Optimize viewport for mobile
●Max Potential First Input Delay 20 ms
●Reduce unused JavaScript
●Avoids enormous network payloads Total size was 779 KiB
●JavaScript execution time 0.0 s
●Minimizes main-thread work 0.6 s
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 0 ms
●Server Backend Latencies 0 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 0 ms
●Avoid large layout shifts 3 layout shifts found
○INP breakdown
○User Timing marks and measures
○Avoid long main-thread tasks
○Avoid non-composited animations
92

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.

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
Último BOE div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Buscar en BOE div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Calendario div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Último BORME div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Buscar en BORME div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Calendario div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Unión Europea (DOUE) div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Boletines autonómicos div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Boletines provinciales div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Legislación div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Tribunal Constitucional div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Jurisprudencia (CENDOJ) div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Doctrina de la Fiscalía div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Derechos fundamentales div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Dictámenes del Consejo de Estado div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Abogacía del Estado div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Derecho de la Unión Europea div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Colección histórica: Gazeta (1661-1959) div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Más búsquedas div#todo-el-derecho > div.contenedor-lista > p.enlaceBuscar > a.link-contenedor-otro
Libros jurídicos electrónicos div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Códigos electrónicos div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Códigos electrónicos universitarios div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Material de oposiciones div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Anuarios y revistas div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
La Editorial del BOE div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
La Librería del BOE div.descripcion > ul.bullet-boe > li > a.link-contenedor-otro
Contactar ul > li > div.enlace > a
Sobre la sede electrónica ul > li > div.enlace > a
Mapa ul > li > div.enlace > a
Aviso legal ul > li > div.enlace > a
Accesibilidad ul > li > div.enlace > a
Protección de datos ul > li > div.enlace > a
Sistema Interno de Información ul > li > div.enlace > a
Tutoriales ul > li > div.enlace > a
Empleo en la AEBOE ul > li > div.enlace > 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>`
●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.
●`[accesskey]` values are unique
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Background and foreground colors have a sufficient contrast ratio
●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
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●Identical links have the same purpose.
○`[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 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
○`<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
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○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.
○`<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 DOM-based XSS with Trusted Types
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
○Document has a valid `rel=canonical`

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