Block
Blocks are boxes of content rendered into an area, or region, of a web page. The default theme Garland, for example, implements the regions "left sidebar", "right sidebar", "content", "header", and "footer", and a block may appear in any one of these areas. The blocks administration page provides a drag-and-drop interface for assigning a block to a region, and for controlling the order of blocks within regions.
Although blocks are usually generated automatically by modules (like the User login block, for example), administrators can also define custom blocks. Custom blocks have a title, description, and body. The body of the block can be as long as necessary, and can contain content supported by any available input format.
When working with blocks, remember that:
- since not all themes implement the same regions, or display regions in the same way, blocks are positioned on a per-theme basis.
- disabled blocks, or blocks not in a region, are never shown.
- when throttle module is enabled, throttled blocks (blocks with the Throttle checkbox selected) are hidden during high server loads.
- blocks can be configured to be visible only on certain pages.
- blocks can be configured to be visible only when specific conditions are true.
- blocks can be configured to be visible only for certain user roles.
- when allowed by an administrator, specific blocks may be enabled or disabled on a per-user basis using the My account page.
- some dynamic blocks, such as those generated by modules, will be displayed only on certain pages.
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