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OpenGraph only (no Twitter tags)

Tests Slack's OG-only fallback. No twitter:* tags are emitted.

Meta tags emitted

<title>OG-only | Slack Unfurl Playground</title>
<meta name="description" content="Only og:* tags are emitted; no twitter:card is set." />
<meta property="og:title" content="OG-only" />
<meta property="og:description" content="Only og:* tags are emitted; no twitter:card is set." />
<meta property="og:image" content="/api/og?title=OG+only&subtitle=no+twitter+tags&style=purple" />
<meta property="og:image:width" content="1200" />
<meta property="og:image:height" content="630" />

Test in Slack

1. Copy this page's URL from your browser.
2. Paste it into a Slack channel.
3. If Slack already cached this URL, append ?v=2 (or any fresh query) to bust the cache.