X (Twitter) card checker
twitter:card chooses the card format on X. summary_large_image is the one that actually shows the picture. Missing the tag and X may not render a card at all.
What we measure
We read <meta name="twitter:card">. Missing is a warning. X falls back to Open Graph for title, description and image, so those still matter — but the card type itself is this tag.
What to put
Use summary_large_image for articles and landing pages. Keep a dedicated twitter:image only if it should differ from og:image; otherwise OG is enough once the card type is set.
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