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Global Structure
Document structure tags are used to apply required structural elements to HTML documents.
Many modern browsers can properly interpret Web documents that do not contain the prescribed
structure, but an improperly constructed document does not represent valid HTML and
may, therefore, not be compatible with all browsers.
Every web document should contain the following structure tags, in this order.
The remaining structure tags are typically unseen by the viewer and allow for more
advanced order information and control markup behavior. These other tags are often
used to share or provide meta-information for their documents.
These tags are used by Web agents, robots, spiders, and other electronic creatures
to understand, categorize, label, and retrieve information from web documents.
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