CSS - Block Level (element|box)
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About
Block-level refers to the (HTML) elements that are formatted visually as blocks.
See for more information: CSS - Block Box Layout
Except for table boxes, and replaced elements, a block-level box can also be a block container box (A container for other boxes).
The “block-level” category roughly corresponds to the element of the category of flow content without the phrasing content elements (hum, hum)