Update article.md

`null` if that's `offsetParent` -> `null` for `offsetParent`
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Peter Roche 2019-11-07 21:34:48 -07:00 committed by GitHub
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@ -104,7 +104,7 @@ For our sample element:
````smart header="Geometry properties are zero/null for elements that are not displayed"
Geometry properties are calculated only for displayed elements.
If an element (or any of its ancestors) has `display:none` or is not in the document, then all geometry properties are zero (or `null` if that's `offsetParent`).
If an element (or any of its ancestors) has `display:none` or is not in the document, then all geometry properties are zero (or `null` for `offsetParent`).
For example, `offsetParent` is `null`, and `offsetWidth`, `offsetHeight` are `0` when we created an element, but haven't inserted it into the document yet, or it (or it's ancestor) has `display:none`.