Fire intersection events on isIntersecting changes #245
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| holding a number between -1 and the length of the observer's {{IntersectionObserver/thresholds}} property (inclusive). | ||
| holding an {{IntersectionObserver}}, a <dfn attribute for=IntersectionObserverRegistration>previousThresholdIndex</dfn> property | ||
| holding a number between -1 and the length of the observer's {{IntersectionObserver/thresholds}} property (inclusive), and | ||
| a <dfn attribute for=IntersectionObserverRegistration>previousIsIntersecting</dfn> property holding a boolean or <code>undefined</code>. |
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Can we get rid of the "undefined" value for previousIsIntersecting, and just initialize it to "false"? The -1 value for previousThresholdIndex will still serve the purpose of forcing the first notification, so it seems like we can safely make previousIsIntersecting a strict boolean.
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Good catch! Yes, we can keep it strict boolean.
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…nts on isIntersecting changes
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Fixes #222. This change should match Blink's existing behavior and EdgeHTML 16's behavior. See #222 (comment) and #222 (comment) for justification.