types: Add WHATWG HTML Spec Types

Signed-off-by: Austin Ziegler <austin@zieglers.ca>

Author: halostatue

CHANGELOG.md

@@ -4,9 +4,12 @@
 
 ## NEXT / YYYY-MM-DD
 
-Manual contributions now require `Signed-off-by` trailers for assertion of the
-[Developer Certificate of Origin][dco]. More details will be added in the coming
-weeks.
+- Manual contributions now require `Signed-off-by` trailers for assertion of the
+  [Developer Certificate of Origin][dco]. More details will be added in the
+  coming weeks.
+
+- Added `application/microdata+json`, `application/speculationrules+json`,
+  `text/event-stream` and `text/ping` from the [WHATWG HTML spec][whatwg]
 
 ## 3.2025.0924 / 2025-09-24
 
@@ -712,6 +715,7 @@ weeks.
   `text/plain`.
 
 [code of conduct]: CODE_OF_CONDUCT.md
+[dco]: https://developercertificate.org
 [httpd]: https://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types
 [issue-18]: https://github.com/mime-types/mime-types-data/issues/18
 [issue-22]: https://github.com/mime-types/mime-types-data/issues/22
@@ -760,4 +764,4 @@ weeks.
 [ruby-mime-types#99]: https://github.com/mime-types/ruby-mime-types/pull/99
 [tika]: https://github.com/apache/tika/blob/main/tika-core/src/main/resources/org/apache/tika/mime/tika-mimetypes.xml
 [tp]: https://guides.rubygems.org/trusted-publishing/
-[dco]: https://developercertificate.org
+[whatwg]: https://html.spec.whatwg.org/multipage/iana.html#text/event-stream

CONTRIBUTING.md

@@ -138,6 +138,7 @@ commit messages. The following types are permitted:
 | `chore` | A code change that is neither a bug fix nor a feature |
 | `docs`  | Documentation updates                                 |
 | `deps`  | Dependency updates, including GitHub Actions.         |
+| `types` | Manually contributed MIME::Types                      |
 
 I encourage the use of [Tim Pope's][tpope-qcm] or [Chris Beam's][cbeams]
 guidelines on the writing of commit messages

types/application.yaml

@@ -3419,6 +3419,14 @@
     - application/MF4
   registered: true
   sort-priority: 16
+- !ruby/object:MIME::Type
+  content-type: application/microdata+json
+  encoding: 8bit
+  xrefs:
+    url:
+    - https://html.spec.whatwg.org/multipage/iana.html#application/microdata+json
+  registered: false
+  sort-priority: 48
 - !ruby/object:MIME::Type
   content-type: application/mikey
   encoding: base64
@@ -5712,6 +5720,14 @@
     - application/spdx+json
   registered: true
   sort-priority: 16
+- !ruby/object:MIME::Type
+  content-type: application/speculationrules+json
+  encoding: 8bit
+  xrefs:
+    url:
+    - https://html.spec.whatwg.org/multipage/iana.html#application/speculationrules+json
+  registered: false
+  sort-priority: 48
 - !ruby/object:MIME::Type
   content-type: application/spirits-event+xml
   encoding: base64

types/text.yaml

@@ -213,6 +213,14 @@
     - text/enriched
   registered: true
   sort-priority: 16
+- !ruby/object:MIME::Type
+  content-type: text/event-stream
+  encoding: 8bit
+  xrefs:
+    url:
+    - https://html.spec.whatwg.org/multipage/iana.html#text/event-stream
+  registered: false
+  sort-priority: 48
 - !ruby/object:MIME::Type
   content-type: text/example
   encoding: quoted-printable
@@ -452,6 +460,14 @@
     - text/parityfec
   registered: true
   sort-priority: 16
+- !ruby/object:MIME::Type
+  content-type: text/ping
+  encoding: 8bit
+  xrefs:
+    url:
+    - https://html.spec.whatwg.org/multipage/iana.html#text/ping
+  registered: false
+  sort-priority: 48
 - !ruby/object:MIME::Type
   content-type: text/plain
   friendly: