Firefox: HTML5 canvas clips the top of score titles

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AI-authored disclosure (alphatab-ai-authored-v1)

Portions of this content were authored by an AI agent. The agent has read
AGENTS.md and the human submitter accepts responsibility for
compliance with the rules in that document.

The top of the score title is cropped in Firefox with core.engine: 'html5'.

Reproduced on macOS with Firefox 146 (DPR 2), alphaTab 1.8.4 and 1.9.0-alpha.1891.

Save as index.html, serve over HTTP, and open in Firefox:

<!doctype html>
<html lang="en">
<meta charset="utf-8">
<title>alphaTab canvas title clipping</title>
<div id="score"></div>
<script src="https://cdn.jsdelivr.net/npm/@coderline/alphatab@1.8.4/dist/alphaTab.min.js"></script>
<script>
  const api = new alphaTab.AlphaTabApi(document.getElementById('score'), {
    core: { engine: 'html5' }
  });
  api.tex('\\title "Lithium" . 0.6.1');
</script>
</html>

Thanks for opening this. Before we dig in, a couple of things need addressing in the description:

Use the bug report template. The bug report template doesn't appear to have been used. Please open the issue via the "Bug Report" template — the form collects the specific info we need to reproduce the problem.

If the description isn't updated within 7 days, this issue will be closed automatically and labeled state-rules-not-followed. Reopen any time — an edit to the description is all it takes.

If an AI helped draft this, AGENTS.md covers the same expectations from the AI side.

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Firefox: HTML5 canvas clips the top of score titles #2953

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Firefox: HTML5 canvas clips the top of score titles #2953

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github-actions commented on Oct 15, 2026

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