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    Node.compareDocumentPosition()

    The Node.compareDocumentPosition() method compares the position of the current node against another node in any other document.

    The return value is a bitmask with the following values:

    Name Value
    DOCUMENT_POSITION_DISCONNECTED 1
    DOCUMENT_POSITION_PRECEDING 2
    DOCUMENT_POSITION_FOLLOWING 4
    DOCUMENT_POSITION_CONTAINS 8
    DOCUMENT_POSITION_CONTAINED_BY 16
    DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC 32

    Syntax

    node.compareDocumentPosition( otherNode ) 
    

    Example

    var head = document.getElementsByTagName('head').item(0);
    if (head.compareDocumentPosition(document.body) & Node.DOCUMENT_POSITION_FOLLOWING) {
      console.log("well-formed document");
    } else {
      console.log("<head> is not before <body>");
    }
    

    Note: Because the result returned by compareDocumentPosition is a bitmask, the bitwise and operator has to be used for meaningful results.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) (Yes) 9.0+ (Yes) (Yes)
    Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) ? (Yes) (Yes)

    Specifications

    Specification Status Comment
    DOM Level 3 Recommendation  
    DOM Standard Living standard  

    See also

    Document Tags and Contributors

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    Last updated by: JacksonGL,