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Header components are assigned HTML header level assignments of H1 through H6. (Similar to size) the header level assigned is determined based on containment within other header components. For example, a header that is not contained by another header component will automatically render as an H1 header level. A child header contained inside this header would automatically render as an H2 header level. While the display of header components is determined by the size skinning selector assigned, HTML header level is important for correct page structure, especially when used with screen reader applications.

The headerLevel attribute by default is -1, where the HTML header level is then calculated by containment as defined above. This is the preferred setting - it is recommended that you design your page nesting header components to take advantage of the automatically assigned header levels. Alternately, setting the headerLevel attribute to values 1 through 6 will force the corresponding HTML header level to render as part of the header component, regardless of its containment with other header components on the page.

Plesae be careful if overriding the header level! The HTML header level assignments (H1 through H6) controlled by this attribute are relied upon by screen reader applications to appropriately identify the underlying structure of the page. Make sure your use of header components and assignment of header levels make sense for your page. When using an override value, consider the effects of having headers inside disclosable sections of the page.

• absolute - an absolute path to the image, like "http://oracleimg.com/admin/images/ocom/hp/oralogo_small.gif"
• relative - a path located relatively to the source page, like "bullet.jpg"
• context relative - a path relatively based on the web application's context root, like "/images/error.png"
• server relative - a path relatively based on the web server by application name, like "//adf-richclient-demo-context-root/images/error.png"

• They must start with a letter (as defined by the Character.isLetter() method) or underscore ( _ ).
• Subsequent characters must be letters (as defined by the Character.isLetter() method), digits as defined by the Character.isDigit() method, dashes ( - ), or underscores ( _ ). To minimize the size of responses generated by JavaServer Faces, it is recommended that component identifiers be as short as possible. If a component has been given an identifier, it must be unique in the namespace of the closest ancestor to that component that is a NamingContainer (if any).

For components with images, the shortDesc is often used to render an HTML alt attribute for the image. Please see the accessibility guidelines section for correct alt text usage of the shortDesc attribute.

shortDesc is also commonly used to render an HTML title attribute, which is used by user agents to display tooltip help text. In this case the behavior for the tooltip is controlled by the user agent, e.g. Firefox 2 truncates long tooltips. For form components, the shortDesc is displayed in a note window. For components that support the helpTopicId attribute and are not using the shortDesc as image alt text, it is recommended that helpTopicId is used instead of shortDesc as it is more flexible and provides more accessible descriptive text than the use of the title attribute.

Sizes for skinning start at size 0 (the largest) and progress to size 5 (the smallest). The size is determined based on containment within other header components, and is accomplished via the assignment of skinning keys. For example, a header that is not contained by another header component will automatically be displayed as size 0. A child header contained inside this header would automatically be displayed as size 1.

The size attribute by default is -1, where the size is then calculated by containment as defined above. This is the preferred setting - it is recommended that you design your page nesting header components to take advantage of the automatically assigned sizes. Alternately, setting the size attribute to values 0 through 5 will force that size skinning value assignment on the header component, regardless of its containment with other header components on the page.

Please note that while header components support a total of six levels of skinning differentiation, less than this may be defined in your skin. Also, setting the header size to something greater then the supported value will style the header the same as the largest supported value. Please see the Skinning Selectors documentation for the assigned skinning keys used by the component.

• default - either flow or stretch, depending on the component's parent container component
• flow - does not support being stretched and will not attempt to stretch the children; the height of the component will be determined by the browser based on the children
• stretch - supports being stretched and will attempt to stretch the sole child or will wrap the children without stretching them; the height of this component is in no way determined by the children. If helpTopicId is also specified, no instruction text will be displayed when stretched because there would be no space allocated for it. Similarly, the "help", "info", and "legend" facets will not be displayed.