This interface provides methods that control display pointers, which enable you to mark sections of an HTML document for editing based on the document's on-screen rendering.
Ambiguities can arise when the display pointer is moved, or when the contents of a document change.
Any element can be made a flow layout element by giving it a height or width attribute. For instance, a p element is not itself a flow layout element because it does not have a definite width of its own. It inherits its width from the flow layout element that contains it. GetLineInfo Retrieves information about the line that the display pointer is on. Ambiguities can arise when the markup pointer is moved, or when the contents of a document are changed next to a markup pointer.