Selection.isCollapsed read-only property returns a
Boolean which indicates whether or not there is currently any text
selected. No text is selected when the selection's start and end points are at the same
position in the content.
Keep in mind that a collapsed selection may still have one (or more, in Gecko)
Selection.rangeCount may not be zero. In that
scenario, calling a
getRangeAt() method may return a
Range object which is collapsed.
bool = sel.isCollapsed
The definition of 'Selection.isCollapsed' in that specification.
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