Scan Module For: HTML Validation

Keep your HTML clean and predictable. The HTML Validation module checks your pages for broken markup—such as unclosed tags, invalid nesting, duplicate IDs, and deprecated elements—that can cause rendering problems, browser inconsistencies, or issues for assistive technology.

Most issues found by HTML Validation are also covered by the Accessibility and Findability modules, so it's off by default. One toggle and it's on.

HTML Validation Scan Module Details

  • Full-site HTML Validation scan

    Scan an entire site, a single page, or a custom list of URLs. BetaSweep discovers pages from your sitemap automatically, with options to exclude paths, filter by page type, or use a different sitemap for staging and localhost sites. No need to enter URLs or test pages one at a time.

    Because BetaSweep runs on your computer, you can validate HTML on localhost, staging environments, and other sites that aren't publicly accessible.

  • Find broken and invalid HTML

    Find unclosed tags, invalid nesting, malformed attributes, and other markup errors that can cause pages to render incorrectly or behave differently across browsers.

  • Find deprecated elements and attributes

    Catch HTML elements and attributes that are no longer part of the current HTML standard, such as <marquee>, <blink>, and inline event handlers. Deprecated markup may still work in some browsers, but it can cause compatibility and accessibility problems and may be harder to maintain.

  • Find duplicate IDs and structural errors

    Detect duplicate element IDs, which can break JavaScript and ARIA references, along with empty elements, incorrect use of void elements, and other structural problems. These issues can cause subtle bugs that are difficult to track down.

  • Check ~30 rules across 4 severity levels

    Each rule includes a plain-language explanation of what's wrong and guidance on how to fix it. Issues are rated Critical, Serious, Moderate, or Minor so you can focus on the problems that need attention first.

  • Keep accessibility checks where they belong

    ARIA and other accessibility-related HTML issues are handled by the Accessibility module, where they get more context and fix guidance. HTML Validation focuses on the structure and validity of your HTML.

  • Download and Share Actionable Reporting

    Prioritize issues by severity

    Every issue is rated Critical, Serious, Moderate, or Minor so you can quickly understand which problems need attention first.

    Get the details to fix each issue

    See the exact HTML element associated with an issue, along with its parent and grandparent elements. Reports also include code snippets so developers can quickly identify the problem in the source code.