Fixes typo

~non-~zero intersection rectangle

files/en-us/web/api/intersection_observer_api/index.md

@@ -128,7 +128,7 @@ When the callback is invoked, it receives a list of `IntersectionObserverEntry`
 
 You can see if the target _currently_ intersects the root by looking at the entry's {{domxref("IntersectionObserverEntry.isIntersecting", "isIntersecting")}} property; if its value is `true`, the target is at least partially intersecting the root element or document. This lets you determine whether the entry represents a transition from the elements intersecting to no longer intersecting or a transition from not intersecting to intersecting.
 
-Note that it's possible to have a non-zero intersection rectangle, which can happen if the intersection is exactly along the boundary between the two or the area of {{domxref("IntersectionObserverEntry.boundingClientRect", "boundingClientRect")}} is zero. This state of the target and root sharing a boundary line is not considered enough to be considered transitioning into an intersecting state.
+Note that it's possible to have a zero intersection rectangle, which can happen if the intersection is exactly along the boundary between the two or the area of {{domxref("IntersectionObserverEntry.boundingClientRect", "boundingClientRect")}} is zero. This state of the target and root sharing a boundary line is not considered enough to be considered transitioning into an intersecting state.
 
 To get a feeling for how thresholds work, try scrolling the box below around. Each colored box within it displays the percentage of itself that's visible in all four of its corners, so you can see these ratios change over time as you scroll the container. Each box has a different set of thresholds: