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Fixed instanceOf HTMLElement to work across contexts #968

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Jan 14, 2018
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7 changes: 6 additions & 1 deletion source/CellMeasurer/CellMeasurer.js
Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,12 @@ export default class CellMeasurer extends React.PureComponent<Props> {

// TODO Check for a bad combination of fixedWidth and missing numeric width or vice versa with height

if (node instanceof HTMLElement) {
if (
node &&
node.ownerDocument &&
node.ownerDocument.defaultView &&
node instanceof node.ownerDocument.defaultView.HTMLElement
) {
const styleWidth = node.style.width;
const styleHeight = node.style.height;

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