resize-observer

Aligns polyfill with spec changes.

Initial value of lastReportedSize changed from 0, 0 to -1, -1 allowing for consistent notifications to be triggered when an element is observed for the first time.

const el = document.createElement('div');
const ro = new ResizeObserver(() => { ... });
ro.observe(el); // Will now notify with size `0, 0`.

https://github.com/w3c/...

• Removes memory leak potential
• Adds back capture phase for events

• Improves event detection in nested documents
• Adds export map

• Rollup both ESM and UMD bundles

• Initial support for Shadow DOM and other documents
• Add touch events
• Fixes UMD build - Thanks @trusktr!