Dmitry Guketlev

Based on @rknoll comment at issue to [Notifications API](https://github.com/whatwg/notifications/issues/146#issuecomment-482612018) Introduce `closeTrigger`.

fix(theme): set correct value for secondary color. (#5348)

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Update secondary color to correct value. Baseline colors for material design can be found [here](https://material.io/design/color/the-color-system.html#color-theme-creation).

Array-selector batch selection

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### Reference Issue Fixes #4939 Fixes #4947 ### Changes in this PR: 1. Added `selectIndexes` and `deselectIndexes` methods for batch items (de)selection and tests for them (separate commit). 2. Refactor...

Add customizable ttl to requireInteraction notifications

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**Disposition:** Currently notifications has only two options. Set `requireInteraction: false` and show notification only for approximately 20 seconds or set `requireInteraction: true` and show notification that will shown forever until...

## Context Polyfill works differently than native implementation because it is limited by browser capabilities. Specifically polyfill lacks special interaction of `ElementInternals` with a11y tools (like screen readers). Native `ElementInternals`...