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Theme Utils aims to be an ever increasing set of helpful utilities for themes and themers. Currently, Theme Utils has 4 utilities.
Block's title to class
Adds the block's title to the block's set of HTML classes (specifically to the block's $classes array variable). Useful when theming to quickly identify and target individual blocks. All blocks (custom, contrib & system) will have the additional class that this module creates added to the set of HTML class attributes.
Block's HTML ID to class
Similar to the above title to class, this adds the block's generated HTML ID to the block's set of HTML classes.
Active regions to body class
Adds the page's active regions to the body's set of HTML classes.
Display @media query
Displays the active @media query(s) in the browser window. Super helpful when building responsive sites.
Display viewport dimensions
Displays the viewport's dimensions in the browser window. Displays values in both px & em.