.htm
3 claimants
1 primary
1 secondary
unambiguous primary
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.
45.6M
total files
17.7M
first seen 2021–2025 (38.8%)
2019
median year (half its files since)
Case variants in archive: .htm (45.0M), .HTM (562.6K), .Htm (1.4K), .hTm (5), .htM (2), .hTM (1) — aggregated above.
Attribution status
This extension is attributed to HTML as primary by 1 authoritative claim.
Authoritative sources: △ Linguist · secondary △ Pygments · secondary ✓ Wikidata · Q8811 △ Wikipedia · secondary
Claimants (5)
Languages that list
.htm among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| HTML | wikidata | primary |
| Ecmarkup | pygments | secondary |
| HTML | linguist | secondary |
| HTML | pygments | secondary |
| VBScript | wikipedia | proposed |
Wikidata says… (7)
File formats, image formats, audio codecs and other non-PL
entities that claim
.htm 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.
| 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 ↗ |
| 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 ↗ |
SWH-mined examples (0)
No archived examples for .htm in our local mirror yet.