[HTML] Add headingoffset & headingreset attributes whatwg/html@e774e8e

Author: triple-underscore

HTML-dom-ja.html

@@ -139,7 +139,7 @@
 
 ●●options
 
-spec_date:2025-08-01
+spec_date:2025-09-17
 trans_update:2025-09-18
 source_checked:240712
 page_state_key:HTML
@@ -240,6 +240,7 @@
 CEReactions:~HEcustom#cereactions
 Reflect:~HTMLcdom#xattr-reflect
 ReflectSetter:~HTMLcdom#xattr-reflectsetter
+ReflectRange:~HTMLcdom#xattr-reflectrange
 LegacyOverrideBuiltIns:~WEBIDLjs#LegacyOverrideBuiltIns
 LegacyUnforgeable:~WEBIDLjs#LegacyUnforgeable
 LegacyLenientThis:~WEBIDLjs#LegacyLenientThis
@@ -328,6 +329,8 @@
 m.getter:#dom-document-nameditem
 m.hasFocus:~HTMLinteraction#dom-document-hasfocus
 m.head:#dom-document-head
+m.headingOffset:#dom-headingoffset
+m.headingReset:#dom-headingreset
 mE.hidden:~HTMLinteraction#dom-hidden
 m.hidden:~HTMLinteraction#dom-document-hidden
 m.hidePopover:~HTMLpopover#dom-hidepopover
@@ -514,6 +517,8 @@
 a.dir:#attr-dir
 a.draggable:~HTMLdnd#attr-draggable
 a.enterkeyhint:~HTMLinteraction#attr-enterkeyhint
+a.headingoffset:~HEsections#attr-headingoffset
+a.headingreset:~HEsections#attr-headingreset
 a.hidden:~HTMLinteraction#attr-hidden
 a.inert:~HTMLinteraction#the-inert-attribute
 a.id:#the-id-attribute
@@ -4406,7 +4411,10 @@ <h4 title="Elements in the DOM">3.2.2. ~DOM内の要素</h4>
   undefined `showPopover$m(`ShowPopoverOptions$I %options = {});
   undefined `hidePopover$m();
   boolean `togglePopover$m(optional (`TogglePopoverOptions$I or boolean) %options = {});
-  [`CEReactions$] attribute DOMString? `popover$m;
+  [`CEReactions$] attribute DOMString? `popover$m
+
+  [`CEReactions$, `Reflect$, `ReflectRange$=(0, 8)] attribute unsigned long `headingOffset@m;
+  [`CEReactions$, `Reflect$] attribute boolean `headingReset@m;
 };
 
 dictionary `ShowPopoverOptions@I {
@@ -6568,6 +6576,8 @@ <h4 title="Global attributes">3.2.6. 大域的な属性</h4>
 <li>`dir$a
 <li>`draggable$a
 <li>`enterkeyhint$a
+<li>`headingoffset$a＊
+<li>`headingreset$a＊
 <li>`hidden$a
 <li>`inert$a
 <li>`inputmode$a

HTML-rendering-ja.html

@@ -202,8 +202,8 @@
 
 ●●options
 
-spec_date:2025-08-12
-trans_update:2025-08-14
+spec_date:2025-09-18
+trans_update:2025-09-19
 source_checked:250719
 page_state_key:CSS
 spec_status:LS
@@ -2761,35 +2761,16 @@ <h4 title="Sections and headings">15.3.6. ~sectionと見出し</h4>
   display: block;
 }
 
-h1 {
-  margin-block: 0.67em;
-  font-size: 2.00em;
-  font-weight: bold;
-}
-h2 {
-  margin-block: 0.83em;
-  font-size: 1.50em;
-  font-weight: bold;
-}
-h3 {
-  margin-block: 1.00em;
-  font-size: 1.17em;
-  font-weight: bold;
-}
-h4 {
-  margin-block: 1.33em;
-  font-size: 1.00em;
-  font-weight: bold;
-}
-h5 {
-  margin-block: 1.67em;
-  font-size: 0.83em;
-  font-weight: bold;
-}
-h6 {
-  margin-block: 2.33em;
+:heading { font-weight: bold; }
+
+:heading(1) { margin-block: 0.67em; font-size: 2.00em; }
+:heading(2) { margin-block: 0.83em; font-size: 1.50em; }
+:heading(3) { margin-block: 1.00em; font-size: 1.17em; }
+:heading(4) { margin-block: 1.33em; font-size: 1.00em; }
+:heading(5) { margin-block: 1.67em; font-size: 0.83em; }
+:heading(6, 7, 8, 9) {
   font-size: 0.67em;
-  font-weight: bold;
+  margin-block: 2.33em;
 }
 </pre>