YAML Markdown Page Summary is a browser bookmarklet that creates a summary of the currently viewed page.
The output text is split into header and body sections, with header properties marked up in YAML and the body in markdown.
I use this bookmarklet to create stub posts for a static site generator, e. g. this page you're reading right now. The header properties are compatible with logya, my generator of choice, I may be biased...
It shouldn't be too hard though to adjust them for use with jekyll, pelican et al.
Drag to add the bookmarklet to your bookmarks bar
You can get the MIT licensed source code on GitHub.
And this is how it looks when creating a preview of this page:
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