Expected Behavior

Our goal is to improve the test coverage of the grommet core.
Components that need attention:
1-10 top components with the lowest coverage score.

1. Video - 60.53%
2. RadioButtonGroup - 61.22%
3. InfiniteScroll - 66.67%
4. RangeInput - 6885%
5. Layer - 70.12%
6. DataChart - 74.76%
7. WorldMap - 7

Feature request summary

Make the clear button on a filter disappear if I need it to!

Rationale

On a filter where one option must always be selected, I don't want to have the 'Clear' button there especially when it is never clickable.

<img width="448" alt="Screen Shot 2020-05-14 at 3 24 42 PM" src="https://user-images.githubusercontent.com/31415327/81977854-a91e8880-95f8-11ea-931

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.11.10

Component

Nav

Environment

Chrome Latest

Reproduction link

Steps to reproduce

期望可以透传s

Is your feature request related to a problem? Please describe.
I use theme-ui on daily basis on personal and work projects. The documentation is quite large and I just want to remember something that I used before so I navigate the whole docs to get it.

Adding search in docs page will make it easy to remember things fast instead of navigating the documentation.

**Describe the solution

EuiInMemoryTable does not allow to inject content between the search bar and the table components.

In some cases, consumers may need to add an additional section of controls in-between

Adding an additional property to the EuiInMemoryTable props to allow to prepend arbitrary react elements before the table, like it is commonly done for many EUI components, such as toolsLeft / `toolsRigh

Proofreading from native speakers wanted. Review and comment on this PR 🙏.

Hi, I am using atomize for a toy project. I noticed that the collapse atom is not very snappy in it's animation, I'd like to speed up the animation. How to do this? Thank you!