Home · Extensions · .html

`.html`

4 claimants 2 primary 0 secondary shared primary (2)

SWH popularity

Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.

4.1B

total files

2.3B

first seen 2021–2025 (55.8%)

2021

median year (half its files since)

Case variants in archive: .html (4.1B), .HTML (280.2K), .Html (19.9K), .HTMl (424), .htmL (371), .HTml (86), .hTML (65), .htML (61), .hTml (48), .HtML (38), .htMl (33), .hTmL (20), .HtMl (17), .HTmL (12), .HtmL (4) — aggregated above.

Attribution status

This extension is attributed to Ecmarkup; HTML as primary by 5 authoritative claims.

Authoritative sources: ✓ Linguist ✓ Pygments ✓ Wikidata · Q8811 △ Wikipedia · secondary

Disagree or have a correction? Open a labelling issue.

Claimants (7)

Languages that list .html among their extensions. Strength reflects whether the upstream source treated it as their primary extension.

Language	Source	Strength
Ecmarkup	linguist	primary
Ecmarkup	pygments	primary
HTML	linguist	primary
HTML	pygments	primary
HTML	wikidata	primary
JScript	wikipedia	proposed
VBScript	wikipedia	proposed

Wikidata says… (11)

File formats, image formats, audio codecs and other non-PL entities that claim .html on Wikidata (property P1195) or in the Wikipedia infobox. Source: data/derived/external_extension_index.csv. Click Use as new PL on any row to open the Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata URL, and this extension — one submission creates the PL + claim.

Right entry isn't listed? Add manually ↗

Format	Class (Wikidata `P31`)	Suggested label	MIME	Notes	Action
Extensible HyperText Markup Language Q166074 markup language which places HTML in XML form	technical standard; XML-based format	data:xml-like	`application/xhtml+xml`	—	Use as new PL ↗
hOCR Q288405 open standard for OCR'd text	markup language; file format	—	`text/html; text/vnd.hocr+html`	—	Use as new PL ↗
HTML 4.0 Q3782232 fourth revision of the HTML standard	markup language; W3C Recommendation	—	`text/html`	—	Use as new PL ↗
HTML5 Q2053 fifth and current version of the hypertext markup language	markup language; file format	—	`text/html`	—	Use as new PL ↗
HyperText Markup Language Q62626012 file format	file format	—	`text/html`	—	Use as new PL ↗
Opera Show Format Q17073241 file format	file format	—	`text/html; application/xhtml+xml`	—	Use as new PL ↗
Simple Standards-Based Slide Show System Q673906 XHTML-based file format for defining slideshows	file format	—	`text/html; application/xhtml+xml`	—	Use as new PL ↗
Vector Markup Language Q1888930 graphics format	XML-based format; vector graphics file format	binary:image	`application/vnd.openxmlformats-officedocument.vmlDrawing`	—	Use as new PL ↗
Netscape bookmarks Q28786544 file format	file format	—	`—`	—	Use as new PL ↗
Research Articles in Simplified HTML Q29151645 file format	document file format	binary:other	`—`	—	Use as new PL ↗
Stylus Labs Write document Q105857208 file format	file format	—	`text/html`	—	Use as new PL ↗

Disambiguation rules (2)

Linguist heuristics that decide, by content, which language a .html file actually is.

Rule	Predicts	Kind	Predicates (truncated)	Measured on SWH
`h/linguist/.html/0`	Ecmarkup	predicates	`[{"kind": "any", "regexes": ["<emu-(?:alg\|annex\|biblio\|clause\|eqn\|example\|figure\|gann\|gmod\|gprose\|grammar\|intro\|not-ref\|note\|nt\|prodref\|production\|rhs\|table\|t\|xref)(?:$\|\\s\|>)"]}]`
`h/linguist/.html/1`	HTML	default	`[]`

SWH-mined examples (0)

No archived examples for .html in our local mirror yet.