The beginning position of any selected text in the document.
Object.defineProperty(DocumentViewerText.prototype, 'selectedTextBegin',
get: function()
)
selectedTextBegin: DocumentViewerTextPosition; // read-only
A DocumentViewerTextPosition object indicating the beginning of selected text, or null if no text is selected.
When HasAnySelectedText is true, SelectedTextBegin will contain the page number and character index of the first character in the document that is selected. SelectedTextEnd will contain the page number and character index of the last character in the document that is selected.
ClearSelection can be used to clear selected text on pages.
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