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Twitter tags only (no OG)

Tests Slack's Twitter-card fallback when OG tags are absent.

Meta tags emitted

<title>Twitter-only | Slack Unfurl Playground</title>
<meta name="twitter:card" content="summary_large_image" />
<meta name="twitter:title" content="Twitter-only" />
<meta name="twitter:description" content="Only twitter:* tags; no og:* tags." />
<meta name="twitter:image" content="/api/og?title=Twitter+only&subtitle=no+OG+tags&style=orange" />

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.