The Node.contains() method returns a Boolean value indicating whether a node is a descendant of a given node or not.
node.contains( otherNode )
This function checks to see if an element is in the page's body. As contains is inclusive and determining if the body contains itself isn't the intention of isInPage this case explicitly returns false.
function isInPage(node) {
return (node === document.body) ? false : document.body.contains(node);
} | Specification | Status | Comment |
|---|---|---|
| DOM The definition of 'Node.contains()' in that specification. | Living Standard | Initial definition |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | 9.0 (9.0) | 5.0[1] | (Yes) | 3.0[2] |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | 9.0 (9.0) | ? | ? | ? |
[1] Internet Explorer only supports contains() for elements.
[2] Safari 2.x implemented contains() incorrectly.
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https://developer.mozilla.org/en-US/docs/Web/API/Node/contains