To HTML Content Category Flow

Html elements del, h1, and output

del element Specifies that the enclosed text has been deleted, h1 element Heading Level 1, output element The output (<output>) element represents the result of a calculation. These elements allows child elements from interactive, embedded, heading, sectioning, phrasing, and metadata content categories.

Restore previous example

del del and h1, del, h1, and output

Advanced example

Click the html element name in the punctuation list to advance the example in 'Tryit-Editor':

You cannot advance example level further.

HTML element example

Result from the Online TryIt-Editor
chrome 1.0safari 1.2Firefox 1.5ie 8.0opera 7.0