This commit adds information to the view encapsulation guide that
describes the styling interactions between components that use differing
view encapsulation modes.
Closes#40715
PR Close#42397
1. In line 25 changed the word "components" to "component's".
2. In line 66 changed the phrase "you never refer to them" to "you should never refer to them".
3. Appended the paragraph containing the above phrase in a `div` with the class `alert is-helpful`.
PR Close#39246
Removes `ViewEncapsulation.Native` which has been deprecated for several major versions.
BREAKING CHANGES:
* `ViewEncapsulation.Native` has been removed. Use `ViewEncapsulation.ShadowDom` instead. Existing
usages will be updated automatically by `ng update`.
PR Close#38882
Pete Bacon Darwin
Panagiotis Kyriazopoulos
Marcono1234
Kristiyan Kostadinov
David Shevitz