[whatwg/dom] preventDefault() on mouseover (and mouseenter?) should cancel default desktop tooltip (#934)

Currently there is no way to cancel default desktop tooltips based on the `title` attribute, apart from removing the title attribute on mouseover and reinstating it on mouseout.

This is common practice, for example in libraries that override tooltip behavior, like bootstrap:
https://github.com/codemix/bootstrap-tooltip/blob/2ced9925ef62264ba6c5d42cbc2e6502348ca147/index.js#L288

Removing this churn can help reduce style thrashing in performance-sensitive areas like hovering.

The idea is that calling `preventDefault()` during a non-passive `mouseover` event would signal the user agent to avoid showing any native tooltip.

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https://github.com/whatwg/dom/issues/934