The front matter in my website’s source files can contain a number of different keyed values. An attempt to list them:

Key|Usage aspect|Name of aspect ratio for galleries and image indexes. Inherited downwards to child pages. blurb|Short text description to display when hovering over rectangular menu link to page css|CSS to inject into generated HTML page date|Date for generated HTML page gallery|At bottom of page generate a thumbnail gallery icon|Image to use in links to page which include a picture image|Image to display at top of page layout|Layout to use for page links|Tags for other HTML pages to regard as children of this page list|At top of page generate a 2-column table of key value pairs precis|Description of page for use o blog indexes resources|List of resources to copy for page tags|Tags for this page title|Title for this page There are defaults for some of these keys: so title defaults to the prettified filename, precis defaults to the start of any text on the page, blurb to the title, aspect to the parent page’s aspect.