HTML Heading Extractor

Audit heading structure locally without crawling or requesting the source website.

HTML source

ReadyHeading order is inspected from parsed markup; no remote page crawl is performed.

Source & result review

Inspect what the browser parsed and what the tool produced

DOMParser ≠ sanitizer

Ready to inspect source and result.

Review is local and detached: this panel never inserts pasted markup into the live page. A browser parser can normalize malformed HTML, but successful parsing does not make markup safe to inject. Scripts, inline event attributes and embedded browsing/plugin elements are reported as active-content signals, not executed.

HTML outline hierarchy audit

Turn extracted headings into a document-outline review. Count H1–H6 levels, flag level skips, empty headings, duplicate heading text and missing IDs so the output is useful for structure and anchor navigation checks.

Duplicate comparisonID review

—Headings

—H1 count

—Level skips

—Outline issues

Ready.

Heading	Level / ID	Issue	Outline consequence

A heading extractor should preserve document hierarchy. This audit does not treat visual font size as semantic heading structure.

Browser-local does not mean standards-complete

HTML parsing is error tolerant. Source diagnostics, sandboxed previews, and transformations do not replace full conformance, security, or production-browser testing.

Heading extraction should preserve document order

Compare the parsed heading count with the extracted rows and review level jumps separately when accessibility or document outline matters.

Parser and sanitizer boundary

HTML DOMParser creates a detached document and may repair or normalize markup. That is useful for inspection, but parsing alone does not sanitize untrusted HTML. Review scripts, inline event attributes, embedded content and application-specific URL/context rules before any live-DOM insertion.