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browser_console_messages reports 0-based line numbers #1839
Description
Reproduction
lines.html:
<title>L</title>
<p>two</p>
<p>three</p>
<script>
console.warn("on line 5");
</script>and ext.js, loaded from a page, with console.error("ext line 2") on its line 2.
Observed
[WARNING] on line 5 @ http://localhost:8765/lines.html:4
[ERROR] ext line 2 @ http://localhost:8765/ext.js:1
Expected
lines.html:5 and ext.js:2, the 1-based numbers that editors and DevTools show. Ideally the column too (:5:9).
Cause
ConsoleMessage.location().lineNumber is 0-based (per the Playwright API docs), and tab.ts:662 prints it as is. A model that follows these numbers into a source file looks one line too early.
Version: @playwright/mcp@0.0.84 (playwright-core 1.65.0-alpha-2026-10-30), Linux, Chrome. Source references are microsoft/playwright main @ 58d69dc, packages/playwright-core/src/tools/.
Activity
github-actions commentedon Nov 6, 2026
microsoft-playwright-automation commentedon Nov 6, 2026
Hi, I'm the Playwright bot. I reproduced this and prepared a fix.
Reproduced on Linux in Chrome, Chromium, Firefox and WebKit, at upstream
1.66.0-next(dc668b5a44c1810a06c7114f405c9ecf975f15ec). The shared formatter prints Playwright's zero-based line unchanged. The fix converts it to one-based output for console responses and console log files, keeping the existingURL:lineformat.Reproduction and checks
The existing
browser_console_messagestest now loads an HTML page withconsole.log("Hello, world!")on line 5 and an external/ext.jscontaining\nconsole.error("Error");, on line 2. Before the fix, all four headless browser projects return:The regression asserts
/:5and/ext.js:2. No browser-specific difference was observed.After the fix,
npm run test-mcp -- console.spec.ts cli-devtools.spec.ts --project=chrome --project=chromium --project=firefox --project=webkit --reporter=linepassed all 168 checks.npm run buildandnpm run flintalso passed.Draft PR: microsoft/playwright#43975
Triaged on Linux by the Playwright bot - agent run
chore: mark v0.0.85 (#1846)
chore: mark v0.1.24 (#529)