Class encapsulating and implementing Block Supports.

Generates an array of HTML attributes, such as classes, by applying to the given block all of the features that the block supports.

Utility method to retrieve the main instance of the class.

Initializes the block supports. It registers the block supports block attributes.

Registers a block support.

Registers the block attributes required by the different block supports.

Generates a string of attributes by applying to the current block being rendered all of the features that the block supports.