This is a sort of label associated to
the page and it is usually displayed by the browsers in their title bar (it is not shown in the rendered
page because it belongs to the head of the document); it can only contain plain text (text that does not
contain other tags). The other element body is the actual content of the page. The body of the page
can contain a mix of plain text and elements.
The HTML syntax relies on some fixed structures (for example, a cell element must be contained inside a
row element) but you can easily experience that browsers are quite tolerant with wrong structures or
badly written markups. Anyway it is a good practice to validate the code (manually or using one of the
many available tools) to avoid browser inconsistencies in visual rendering. Browsers already behave in
different ways with codes that respect standards.
When you explore the HTML code of many pages in different sites, a very wide adoption of indentation
styles and use of whitespaces can be encountered. This is possible because multiple whitespaces are
treated as one unless a specific style rule exists to say something different.
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