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The navigation blocks can be defined by | The navigation blocks can be defined by | ||
* [http://www.w3.org/TR/CSS2/visuren.html#positioning-scheme layout flow] controlled by CSS position or | * [http://www.w3.org/TR/CSS2/visuren.html#positioning-scheme layout flow] controlled by CSS position or float properties; | ||
* [http://www.w3.org/TR/html5/semantics.html#sections section elements] like nav or footer elements; | * [http://www.w3.org/TR/html5/semantics.html#sections section elements] like nav or footer elements; | ||
* editable areas like HTML input element or div@contentEditable="true". | * editable areas like HTML input element or div@contentEditable="true". | ||
If section elements aren't used on web page then all content of the normal flow is contained by one navigation block that may contain nested blocks. In contrast to normal flow content the | If section elements aren't used on web page then all content of the normal flow is contained by one navigation block that may contain nested blocks. In contrast to normal flow content the float content or the absolute positioned content are presented by its own blocks, i.e. each container (where the flow is changed) is represented by its own navigation block. | ||
The navigation blocks can be nested. For example, if the content contains an editable area then the area is presented by its own block which is contained by the containing parent block. | The navigation blocks can be nested. For example, if the content contains an editable area then the area is presented by its own block which is contained by the containing parent block. | ||