Markdown alternate link

A rel="alternate" link pointing to text/markdown tells an agent a Markdown copy exists, so it does not have to guess.

Category: Content accessibility
Standard: Emerging; Off by default, turn on in settings

2%Top 100 adoption2 of 99 sites implement it 4/9OverviewSpeculativeSpecified, but little evidence anything uses it yet.

Who supports it

No agent or browser has announced support yet.

27 others: no evidence yet. See every agent and browser

What it checks

The extension looks for a link to a Markdown copy of the page in two places:

The HTTP Link response header, with type="text/markdown".
A <link rel="alternate"> element on the rendered page with a text/markdown type.

Results

Status	When
Pass	A Markdown alternate is advertised in the `Link` header or the page
N/A	No Markdown alternate is advertised

How to fix

Add a <link> element to the page’s <head> pointing to its Markdown copy:

<link rel="alternate" type="text/markdown" href="https://example.com/docs/setup.md" />

Or send the equivalent response header:

Link: <https://example.com/docs/setup.md>; rel="alternate"; type="text/markdown"

Support by agent and browser

Announced means the vendor’s own docs or announcement say so. Published is the date on the vendor’s own page, where it has one. Checked is the last time our weekly research found that page still saying so.

No agent or browser has announced anything about this yet.

No evidence yet27

ChatGPT
Claude
Gemini
Perplexity
Copilot
Meta AI
ChatGPT Atlas
Comet
Dia
Gemini in Chrome
Edge Copilot Mode
Claude Code
Cursor
Codex
GitHub Copilot
Windsurf
CCBot
Applebot
Amazonbot
Bytespider
Cohere
Mistral
DuckAssist
Chrome
Edge
Firefox
Safari

Names and marks belong to their owners and are used only to identify products. None of these vendors is affiliated with Sitebulb. Spotted something out of date? Send a correction.

Adoption on the top 100 sites

2 of 99 measured sites implement it

Scanned 23 Oct 2026 with the Sitebulb Labs extension, against the Tranco list (tranco-56Z8N). 1 sites couldn’t be measured (bot challenge or timeout) and are left out of the share.

9 Oct 2026 3% → 23 Oct 2026 2%

Sites implementing it2

#2 cloudflare.com
#55 wordpress.org

Overview

4/9

Speculative

Specified, but little evidence anything uses it yet.

How this rating is worked out4 of 9 points

Factor	Points	Why
Vendor support	0 / 3	0 vendors supporting, 0 partly or planned
Top-100 adoption	1 / 3	2% of measured sites
Spec maturity	3 / 3	Published standard

8 or more points is Established, 5 to 7 is Gaining traction, 2 to 4 is Speculative and under 2 is Stalled. A feature is also Stalled when more vendors have said no than yes. Read the spec.

Community insights

No community insights for this feature yet.

Quotes are from public posts, checked against the original before they appear here. Suggest an insight, or ask for yours to be removed.