3.5 Demonstrate ability to write template pre-process functions for overriding custom output
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Review how and where to access the HTML preprocess function and the page preprocess function. Review where to access the body class.
Pre-process functions allow variables to be manipulated before rendering. Preprocess functions are defined in the THEME_NAME.theme file or in a custom module.
For example
Some variables that are available to html.html.twig and hook_preprocess_html() include * doctype * html * body tags
Some variables that are available to html.html.twig include page elements and regions.