These elements must be in the html/head section of your document.
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<metaproperty="og:type"content="website"><metaproperty="og:title"content="Social Image Preview Override From Markdown Metadata v18 - Mkdocs Material Social Card Testing"><metaproperty="og:description"content="A custom description for this page."><metaproperty="og:image"content="https://dmccreary.github.io/mkdocs-material-social/assets/images/social/metadata-override-test.png"><metaproperty="og:image:type"content="image/png"><metaproperty="og:image:width"content="1200"><metaproperty="og:image:height"content="630"><metaproperty="og:url"content="https://dmccreary.github.io/mkdocs-material-social/metadata-override-test/"><metaname="twitter:card"content="summary_large_image"><metaname="twitter:title"content="Social Image Preview Override From Markdown Metadata v18 - Mkdocs Material Social Card Testing"><metaname="twitter:description"content="A custom description for this page."><metaname="twitter:image"content="https://dmccreary.github.io/mkdocs-material-social/assets/images/social/metadata-override-test.png">