When you paste a link into a single link in your post content, Typlog will fetch this link. If this link contains Open Graph data or Twitter card data, Typlog will render this link into a bookmark block.
To create a bookmark block like the one above, you can paste the link in your post:
Content above ... <https://lepture.com/zh/2017/hanabi> Content below ...
Typlog will ONLY display the link into a bookmark when the webpage contains
UPDATE: Typlog will "fetch" the links when you preview your post.