fix: report comments before a comma-continued concise attr line

.changeset/concise-attr-line-comments.md

@@ -0,0 +1,5 @@
+---
+"htmljs-parser": patch
+---
+
+Report the comments on the lines before a comma-continued concise attr line through `onOpenTagComment`. They were skipped without an event, so consumers dropped them.

agent-feedback/items/2026-09-23-bench-compare-installs-with-npm.md

@@ -0,0 +1,12 @@
+---
+type: dx
+impact: low
+effort: low
+site: bench.ts
+---
+
+# Install the COMPARE build with pnpm in the bench
+
+`COMPARE=<ref> pnpm run bench` clones the ref and runs `npm ci && npm run --if-present build` in it, but the repo only has a `pnpm-lock.yaml`, so `npm ci` exits with `EUSAGE` and the comparison never runs. Run `pnpm install --frozen-lockfile && pnpm run build` instead. Because the clone's directory is created before the install, a failed run also leaves it behind, and the next run sees it and skips the install, then fails to import the unbuilt `dist`. Only treat the clone as ready once its build has finished.
+
+Check: `rm -rf "$TMPDIR/htmljs-bench-main" /tmp/htmljs-bench-main; COMPARE=main GREP=attr-comma pnpm run bench` fails with `The npm ci command can only install with an existing package-lock.json`.

src/__tests__/fixtures/attr-comma-multiline-comments/__snapshots__/attr-comma-multiline-comments.expected.txt

@@ -4,12 +4,16 @@
  │     │  │╰─ attrValue.value "bar"
  │     │  ╰─ attrValue "=bar"
  ╰─    ╰─ attrName "foo"
-3├─   // comment
+3╭─   // comment
+ │    │ ╰─ openTagComment.value " comment"
+ ╰─   ╰─ openTagComment "// comment"
 4╭─   ,bar=baz
  │     │  │╰─ attrValue.value "baz"
  │     │  ╰─ attrValue "=baz"
  ╰─    ╰─ attrName "bar"
-5├─   /* block */
+5╭─   /* block */
+ │    │ ╰─ openTagComment.value " block "
+ ╰─   ╰─ openTagComment "/* block */"
 6╭─   ,qux=qux
  │     │  │╰─ attrValue.value "qux"
  │     │  ╰─ attrValue "=qux"

src/__tests__/fixtures/open-tag-comments-concise/__snapshots__/open-tag-comments-concise.expected.txt

@@ -11,6 +11,19 @@
  │  ├─ closeTagEnd(div)
  │  ├─ openTagEnd
  ╰─ ╰─ tagName "span"
-3╭─ 
+3╭─ input
+ │  ├─ closeTagEnd(span)
  │  ├─ openTagEnd
- ╰─ ╰─ closeTagEnd(span)
+ ╰─ ╰─ tagName "input"
+4╭─   // e
+ │    │ ╰─ openTagComment.value " e"
+ ╰─   ╰─ openTagComment "// e"
+5╭─   /* f */
+ │    │ ╰─ openTagComment.value " f "
+ ╰─   ╰─ openTagComment "/* f */"
+6╭─   ,type="text"
+ │     │   │╰─ attrValue.value "\"text\""
+ │     │   ╰─ attrValue "=\"text\""
+ ╰─    ╰─ attrName "type"
+7╭─ 
+ ╰─ ╰─ openTagEnd

src/__tests__/fixtures/open-tag-comments-concise/input.marko

@@ -1,2 +1,6 @@
 div /* c */ a=1
 span // d
+input
+  // e
+  /* f */
+  ,type="text"

src/states/OPEN_TAG.ts

@@ -131,10 +131,10 @@ export const OPEN_TAG: StateDefinition<OpenTagMeta> = {
             }
           }
 
-          // comma continues the open tag with another line attribute
+          // comma continues the open tag with another line attribute, so
+          // the comments before it are parsed as part of the open tag
           if (data.charCodeAt(cur) === CODE.COMMA) {
-            this.pos = cur + 1;
-            this.consumeWhitespace();
+            this.pos += len;
             continue;
           }