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Showing content from https://webplatform.github.io/docs/dom/Selection below:

Selection · WebPlatform Docs

Represents the text selection in the greater page, possibly spanning multiple elements, when the user drags over static text and other parts of the page.

Selection is the class of the object returned by window.getSelection() and other methods. For information about text selection in an individual text editing element, see Input, TextArea and document.activeElement which typically return the parent object returned from window.getSelection().

anchorNode

Returns the element or node that contains the start of the selection.

anchorOffset

Returns the number of characters that the selection’s anchor is offset within the anchorNode.

focusNode

Retrieves the element or node that contains the end of a selection.

focusOffset

Returns the number of characters that the selection’s focus is offset within the focusNode.

isCollapsed

Retrieves whether a selection is collapsed or empty.

rangeCount

Returns the number of ranges in a selection

typeDetail
:

addRange

Adds a Range to the current selection.

clear

The clear() method is not in HTMLSelection Object.

Use the removeAllRanges Method instead.

collapse

Replaces the current selection with an empty selection (or a caret) at the given offset.

collapseToEnd

Collapses or sets the insertion point or caret at the end of a selection object.

If the content the selection is in is focused and editable, the caret will blink there.

collapseToStart
:

createRange
:

createRangeCollection
:

deleteFromDocument

Deletes the selected nodes from a document.

getRangeAt

Returns a specified Range from a selection. The Range is specified by an index and cannot be greater than the number that is returned by rangeCount.

removeAllRanges

Removes all ranges from a selection.

removeRange

Removes a range from a selection.

selectAllChildren

Adds all the children of the specified node to the selection. Previous selection is lost.

No events.

A selection object represents the ranges that the user has selected. Typically, it holds only one range, accessed as follows:

var selObj = window.getSelection();
if(selObj.rangeCount){ range  = selObj.getRangeAt(0);}

W3C HTML5

Proposed Recommendation

• Mozilla Developer Network : [Selection Object Article]

• Microsoft Developer Network: [HTMLSelection Object Article]

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