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site: add Open Graph/Twitter social preview tags + 1200x630 og-image - #61
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index.html had a title but zero og:/twitter: tags and an empty meta description, so every share of webglsamples.org rendered as a bare URL. - Add full OG set (type/site_name/title/description/url/image + image:type/width/height) - Add Twitter Card summary_large_image - Fill the empty meta description - Add 1200x630 og-image.png (Pillow-only generator in tools/make-og-image.py)
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This PR adds Open Graph and Twitter Card social preview tags to the WebGL Samples homepage, plus a 1200×630 OG image.
The problem:
index.htmlhad a<title>but zeroog:/twitter:tags and an empty meta description. Every time a link to webglsamples.org is shared on Twitter/X, Slack, Discord, iMessage, or LinkedIn, it renders as a bare URL with no preview card.What's included:
og:type,og:site_name,og:title,og:description,og:url,og:image(+image:type/width/height)summary_large_imagewith title/description/imageog-image.png— dark 3D wireframe-cube card using the site's brand palette (#0090c5 blue, #ff4486 pink), generated by a reproducible Pillow-only script (tools/make-og-image.py)The image is referenced at the absolute production URL
https://webglsamples.org/og-image.pngso it works once merged and deployed.No build system changes — this is a static site, so the tags land directly in the served HTML.