Accessibility
Standards
| Standard | Description |
|---|---|
| Accessibility best practices | Common accessibility best practices. |
| ARIA attributes | Accessibility properties for screen readers. |
| Audio and video | Alternative text, captions, and transcripts. |
| Color contrast | Difference between text and background colors. |
| Hidden elements | Ensure hidden elements are accessible. |
| Language | Use correct language attributes for accessibility. |
| Names and labels | Descriptive identifiers for elements. |
| Navigation | Application keyboard navigation. |
| Tables and lists | Ensure tables and lists are accessible. |
Content
Standards
| Standard | Description |
|---|---|
| Page title | Describes webpage content in a few words. |
| Page description | Describes webpage content in a few words. |
| Viewport meta tag | Makes websites fit all screen sizes. |
Domain
Standards
| Standard | Description |
|---|---|
| Hypertext Transfer Protocol Secure (HTTPS) | Privacy and integrity protection. |
| www resolution | One domain works with www and non-www. |
| sTLD | Sponsored top-level domain (.gov / .edu / .mil). |
Performance
Standards
| Standard | Description |
|---|---|
| Cumulative Layout Shift (CLS) | Measures unexpected webpage content shifts. |
| First Contentful Paint (FCP) | The page begins to display within 1.8 seconds. |
| Interaction to Next Paint (INP) | Page responds in under 0.2 seconds. |
| Largest Contentful Paint (LCP) | Major content loads in 2.5 seconds. |
| Time to First Byte (TTFB) | Code received in 0.8 seconds. |
SEO
Standards
| Standard | Description |
|---|---|
| Sitemap status | The HTTP status of /sitemap.xml is OK. |
| Sitemap XML | The sitemap file type is XML. |
| Sitemap complete | Every link on the home page is in the sitemap. |
| Robots valid | The site has a valid robots policy. |
| Robots allowed | The robots policy allows access to browsers and scrapers. |
| Sitemap | The robots.txt file points to a sitemap file. |
| Canonical | Use preferred page URLs to avoid duplication. |
Security
Standards
| Standard | Description |
|---|---|
| Content security policy (CSP) | The site restricts what can be loaded. |
| HTTP Strict Transport Security (HSTS) | Site upgrades to a secure connection. |
| security.txt | The site has a security.txt file. |
| X-Content-Type-Options | The site prevents mime type sniffing. |
Social
AI friendly
Standards
| Standard | Description |
|---|---|
| Crawlable | Site is available for indexing by well-behaved agents. |
| Content available in document | Page main content is available in initial document. |