How to use this developer tool
- Paste the html links or load the sample.
- Adjust any options shown below the editor.
- Select Check rel Attributes or press Ctrl/Cmd + Enter.
- Review diagnostics before copying or downloading the result.
Link Rel Attribute Checker
Inspect link elements and anchor tags for rel tokens that affect security, discovery, and resource hints. It reports invalid combinations, missing noopener protection, and attributes that do not fit the element.
Developer Input
HTML linksAd space
What this developer tool does
The result panel shows the processed html links, a concise status, and measurements that describe this specific run.
The page parses the supplied text locally, applies link rel attribute checker rules, and produces a deterministic, copy-ready result.
Warnings identify conditions worth reviewing; they do not replace testing in the browser or service that consumes the output.
Example
The included sample demonstrates a representative input. Running it produces the exact format shown in the output panel, including any relevant diagnostics.
<link rel="canonical" href="https://example.com/docs"> <link rel="preload" href="/app.css" as="style"> <a href="https://external.example" target="_blank">External docs</a>
Use cases
- Prepare metadata or server-facing files before a release.
- Audit a copied head fragment during an SEO review.
- Turn structured notes into consistent deployment markup.
Tips for reliable output
- Use absolute URLs where a crawler must resolve the resource.
- Keep values aligned with the final production origin.
- Act on warnings before copying the result.
- Test generated output in a staging page.
- Re-run the tool after changing filenames or routes.
Processing details
All parsing and generation happens in the current browser tab. Values are normalized only where the relevant format permits it, and the original input is never uploaded.
Live fetch results, crawler caches, HTTP response headers, and platform-specific acceptance checks are outside this page’s browser-only scope.
Frequently asked questions
What input does the Link Rel Attribute Checker accept?
Use the labeled sample format shown in the input panel. The parser ignores blank lines but reports missing required values.
Can I use the Link Rel Attribute Checker without uploading a file?
Yes. Paste text directly into the editor or load the included sample; processing stays in the browser.
Does this tool send my input to a server?
No. The page processes the supplied text locally with browser APIs and makes no network request for its core function.
How should I verify the generated output?
Review the summary and warnings, then test the output in the browser or platform that will consume it before deployment.
What are the limits of the Link Rel Attribute Checker?
It checks and generates the documented fields, but it does not reproduce crawler caches, browser installability rules, or live server behavior.
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Output reference
| Item | Meaning |
|---|---|
| Output | Copy-ready TXT result |
| Summary | Processing status for this run |
| Warnings | Conditions to verify before deployment |
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