[Front Matter][Jekyll-FrontMatter] is the meta data block in the beginning of an markdown blog post entry which will be processed by [Jekyll][Jekyll] to generate HTML webpages.
The block is surrounded by `---`, the format is `yaml`-based.
There are predefined variables and custom variables. [Default][Jekyll-FrontMatter-Defaults] values, to enforce the 'Don't repeat yourself (DIY)' pattern can be set in the config file.
## Predefined values
The most important keys are `t…