United States · Santa Clara Completed: Apr 21, 2026 19:46 UTCMobile 375 × 812
Desktop 1440 × 900
Score: 74 / 100
Based on 8 categories, 0 sections
Fast site — your users get a smooth experience.
Several missing protections leave your users and data exposed.
Major barriers for users with disabilities — up to 15% of your audience.
Well-optimized for search — your content is discoverable.
Good server performance with room for optimization.
Mostly compliant — a few items need attention.
Good content signals with minor gaps.
Lean and efficient — low environmental impact per visit.
The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.
Weights reflect general web best practices. Individual needs may differ.
Content-Security-Policy header is missing
Security gaps expose your site and users to attacks, eroding trust.
No Content-Security-Policy header found
Security gaps expose your site and users to attacks, eroding trust.
1 link(s) with no accessible text
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
2 button(s) with no accessible text
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
4 image-in-link without alt text
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
High impact, low effort — start here.
High impact, requires investment.
Small gains, minimal effort.
Nothing in this quadrant — good news.
Low impact, high effort — do last.
Nothing in this quadrant — good news.
[](https://beavercheck.com/results/4ff83f0a-f842-4429-9c61-20d9eadeec7c)<a href="https://beavercheck.com/results/4ff83f0a-f842-4429-9c61-20d9eadeec7c"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fisc.org" alt="BeaverCheck Score"></a>https://beavercheck.com/badge?url=https%3A%2F%2Fisc.orgThis badge auto-updates with your latest scan result.
Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. Addressing the critical issues below would have the most immediate impact on your user trust.
8 barrier(s) likely increasing bounce by ~23%.
Page loads in 3.8s
+5% bounceEvery additional 100ms above 2.5s costs conversions — you're 1.3s over
Fix: Target <2.5s LCP: defer non-critical scripts and optimize the hero image
High main-thread blocking time
+2% bouncePage is non-interactive for 478ms after first paint
Fix: Defer third-party scripts and split large bundles
No HSTS header
+1% bounceReturning visitors are briefly exposed to downgrade attacks on first request
Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains
No Content-Security-Policy header
+1% bounceHigher XSS blast radius — one compromised script can exfiltrate the checkout form
Fix: Ship a reporting-only CSP first, then enforce once violations are clean
Severe layout shift during page load
+6% bounceUsers mis-click when content jumps — converting intent into frustration
Fix: Reserve space for images, ads, and embeds with explicit width/height
No structured data
+2% bounceNo rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices
Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)
5 link(s) with generic text ("click here", "read more")
+1% bounceScreen-reader users navigating by link list see no context — and search engines can't infer relevance
Fix: Rewrite with descriptive phrases that identify the destination
No skip-to-content link
+1% bounceKeyboard and screen-reader users must tab through the entire header on every page
Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element
Preliminary CRO audit — each barrier links to the tab with detailed analysis.
$550 investment → $2,451/month returns + USD 157,500 risk avoided
$550
6h · 5 findings
$2,451 /mo
~$29,418 / year
USD 157,500
if kept compliant
$100 — in quick wins — start here for the fastest payback
Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.
5.5 developer hours at $100/hr
Based on United States rates ($100/hr)
Start here for the best return on investment
$13,125 / month at risk
~$157,502 / year if left unfixed
$157,500
+10 more
$0.16 /mo
2047.9 MB/mo × 0.080 USD/GB
Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.
Unique monthly visitors from your analytics
Purchases, signups, or key actions
Optional — for revenue estimation
more engaged visitors from reduced bounce
Fix 5 critical issues to capture this value
Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.
Your site's LCP: → estimated after fixes.
These are estimates based on industry research — actual results vary
Your data stays in your browser — nothing is sent to our servers
Thanks for your feedback!
We'll use a cached audit if available, or offer to scan.
Industry-standard audits powered by Google Lighthouse.
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.
2.44 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.80 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
478 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.444
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.44 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.
5.16 s
Audit breakdown by category with detailed findings.
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
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
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.
Source: Google web.dev / Lighthouse
3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.
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.
Performance issues directly impact user engagement and conversion rates.
| Request | Cache TTL | Transfer Size |
|---|---|---|
| www.isc.org/images/backgrounds/banner_small.webp | 0.0 ms | 38.5 KiB |
| www.isc.org/images/blog/net.jpg | 0.0 ms | 35.6 KiB |
| www.isc.org/js/bundle.js | 0.0 ms | 35.3 KiB |
| www.isc.org/images/kea.png | 0.0 ms | 18.0 KiB |
| www.isc.org/images/banner/banner-dots.png | 0.0 ms | 17.1 KiB |
| www.isc.org/images/bind9.png | 0.0 ms | 15.7 KiB |
| www.isc.org/images/logo.png | 0.0 ms | 10.8 KiB |
| www.isc.org/images/dhcp.png | 0.0 ms | 10.1 KiB |
| www.isc.org/scss/style.min.css | 0.0 ms | 7.0 KiB |
| www.isc.org/images/stork80x.png | 0.0 ms | 6.5 KiB |
| www.isc.org/plugins/modernizr/modernizr-custom.js | 0.0 ms | 5.8 KiB |
| www.isc.org/images/backgrounds/footer.webp | 0.0 ms | 3.8 KiB |
| www.isc.org/images/blog/bind9label.jpg | 0.0 ms | 3.2 KiB |
Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
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.
Performance issues directly impact user engagement and conversion rates.
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Est Savings |
|---|---|
| cdn.jsdelivr.net/gh/lykmapipo/themify-icons@0.1.2/fonts/themify.woff | 15 ms |
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
ISC div.row > div.col-lg-4 > a > img.img-fluid | www.isc.org/images/logo.png | 10.6 KiB | 7.8 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| www.isc.org/scss/style.min.css | 7.0 KiB | 150 ms |
| www.isc.org/plugins/modernizr/modernizr-custom.js | 5.8 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| isc.org/ | 755 ms |
| www.isc.org/ | 0.0 ms |
These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
body body | 0.443 |
Open Source Means Freedom, But Also Responsibility
ISC develops and distribute… body > section.section | 0.001 |
div.navbar > div#navigation > div.search > button#searchOpen div.navbar > div#navigation > div.search > button#searchOpen | 0.000 |
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.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| cdn.jsdelivr.net/npm/bootstrap@4.1.3/dist/css/bootstrap.min.css | 22.8 KiB | 21.7 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.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.
Source: Google web.dev / Lighthouse
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.googletagmanager.com/gtag/js?id=G-EF669E5YC2 | 172.4 KiB | 55.8 KiB |
| www.isc.org/js/bundle.js | 32.2 KiB | 25.6 KiB |
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid | www.isc.org/images/blog/bind9label.jpg |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid | www.isc.org/images/blog/net.jpg |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid | www.isc.org/images/blog/net.jpg |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid | www.isc.org/images/blog/bind9label.jpg |
ISC div.container > div.navbar > a.navbar-brand > img.img-fluid | www.isc.org/images/logo.png |
ISC div.row > div.col-lg-4 > a > img.img-fluid | www.isc.org/images/logo.png |
More information about the performance of your application. These numbers don't directly affect the Performance score.
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.
Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Quality Open Source div.row > div.col-lg-4 > a.feature-item > h4.text-secondary |
How to report a security vulnerability, 101 div.blog-post > div.post-content > a > h4.text-white |
These are opportunities to improve keyboard navigation in your application.
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
body > a body > a |
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.
One main landmark helps screen reader users navigate a web page. Learn more about landmarks.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
html.mod_ html.mod_ |
These items highlight common accessibility best practices.
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.
Descriptive link text helps search engines understand your content. Learn how to make links more accessible.
Performance issues directly impact user engagement and conversion rates.
| Link destination | Link Text |
|---|---|
| www.isc.org/bind | Learn more |
| www.isc.org/dhcp | Learn more |
| www.isc.org/kea | Learn more |
| www.isc.org/stork | Learn more |
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
Format your HTML in a way that enables crawlers to better understand your app’s content.
Industry-standard audits powered by Google Lighthouse. — Desktop
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.
679 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
989 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
14 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.403
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
679 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.
1.23 s
Audit breakdown by category with detailed findings.
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
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
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.
Source: Google web.dev / Lighthouse
3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.
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.
Performance issues directly impact user engagement and conversion rates.
| Request | Cache TTL | Transfer Size |
|---|---|---|
| www.isc.org/images/backgrounds/banner.webp | 0.0 ms | 69.7 KiB |
| www.isc.org/images/blog/net.jpg | 0.0 ms | 33.3 KiB |
| www.isc.org/js/bundle.js | 0.0 ms | 33.0 KiB |
| www.isc.org/images/banner/banner-dots.png | 0.0 ms | 19.4 KiB |
| www.isc.org/images/kea.png | 0.0 ms | 18.1 KiB |
| www.isc.org/images/bind9.png | 0.0 ms | 15.7 KiB |
| www.isc.org/images/logo.png | 0.0 ms | 10.8 KiB |
| www.isc.org/images/dhcp.png | 0.0 ms | 10.2 KiB |
| www.isc.org/scss/style.min.css | 0.0 ms | 7.0 KiB |
| www.isc.org/images/stork80x.png | 0.0 ms | 6.4 KiB |
| www.isc.org/plugins/modernizr/modernizr-custom.js | 0.0 ms | 5.8 KiB |
| www.isc.org/images/blog/bind9label.jpg | 0.0 ms | 5.4 KiB |
| www.isc.org/images/backgrounds/footer.webp | 0.0 ms | 3.7 KiB |
Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
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.
Performance issues directly impact user engagement and conversion rates.
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Est Savings |
|---|---|
| cdn.jsdelivr.net/gh/lykmapipo/themify-icons@0.1.2/fonts/themify.woff | 10 ms |
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
ISC div.row > div.col-lg-4 > a > img.img-fluid | www.isc.org/images/logo.png | 10.6 KiB | 7.8 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size |
|---|---|
| www.isc.org/plugins/modernizr/modernizr-custom.js | 5.8 KiB |
| www.isc.org/scss/style.min.css | 7.0 KiB |
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| cdn.jsdelivr.net/npm/bootstrap@4.1.3/dist/css/bootstrap.min.css | 22.8 KiB | 21.4 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.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.
Source: Google web.dev / Lighthouse
| URL | Transfer Size | Est Savings |
|---|---|---|
| www.googletagmanager.com/gtag/js?id=G-EF669E5YC2 | 172.2 KiB | 56.3 KiB |
| www.isc.org/js/bundle.js | 32.2 KiB | 25.6 KiB |
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid | www.isc.org/images/blog/bind9label.jpg |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid | www.isc.org/images/blog/net.jpg |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid | www.isc.org/images/blog/net.jpg |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid | www.isc.org/images/blog/bind9label.jpg |
ISC div.container > div.navbar > a.navbar-brand > img.img-fluid | www.isc.org/images/logo.png |
ISC div.row > div.col-lg-4 > a > img.img-fluid | www.isc.org/images/logo.png |
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| isc.org/ | 201 ms |
| www.isc.org/ | 0.0 ms |
These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
body body | 0.402 |
BIND
Kea/DHCP
SUPPORT
COMMUNITY
ABOUT ISC
DOWNLOADS nav.nav > div.container > div.navbar > div#navigation | 0.001 |
BIND
Kea/DHCP
SUPPORT
COMMUNITY
ABOUT ISC
DOWNLOADS nav.nav > div.container > div.navbar > div#navigation | 0.000 |
BIND
Kea/DHCP
SUPPORT
COMMUNITY
ABOUT ISC div.container > div.navbar > div#navigation > ul.nav-sections | 0.000 |
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.
When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.navbar > div#navigation > div.search > button#searchOpen div.navbar > div#navigation > div.search > button#searchOpen |
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
body > a body > a |
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.
Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Quality Open Source div.row > div.col-lg-4 > a.feature-item > h4.text-secondary |
How to report a security vulnerability, 101 div.blog-post > div.post-content > a > h4.text-white |
These are opportunities to improve keyboard navigation in your application.
One main landmark helps screen reader users navigate a web page. Learn more about landmarks.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
html.mod_ html.mod_ |
These items highlight common accessibility best practices.
Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.
Performance issues directly impact user engagement and conversion rates.
| URL | Aspect Ratio (Displayed) | Aspect Ratio (Actual) | |
|---|---|---|---|
ul.nav-links > li.nav-item > a > img ul.nav-links > li.nav-item > a > img | www.isc.org/images/stork80x.png | 40 x 40 (1.00) | 80 x 70 (1.14) |
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.
Descriptive link text helps search engines understand your content. Learn how to make links more accessible.
Performance issues directly impact user engagement and conversion rates.
| Link destination | Link Text |
|---|---|
| www.isc.org/bind | Learn more |
| www.isc.org/dhcp | Learn more |
| www.isc.org/kea | Learn more |
| www.isc.org/stork | Learn more |
Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
div.row > article.col-md-6 > div.blog-post > img.img-fluid div.row > article.col-md-6 > div.blog-post > img.img-fluid |
Format your HTML in a way that enables crawlers to better understand your app’s content.
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