Accordion's animate removes the outline

### Description

.focusOutline:focus-visible {
outline: 3px solid green;
outline-offset:5px;
z-index:99;
}
I have added Outline:focus-visible and animate to the accordion. During the animation/transition the outline outside of the accordion disappears.

https://codepen.io/wilson-ruan/pen/yLjwyNO

### Reproduction Steps

Keyboard tab into the header and hit enter.

### Relevant Logs

```shell
.focusOutline:focus-visible {
outline: 3px solid green;
outline-offset:5px;
z-index:99;
}
```

### Browser(s) Affected

_No response_

### OS(s) Affected

_No response_

### Device(s) Affected

_No response_

### AMP Version Affected

_No response_

Start with the linked CodePen reproduction and inspect the accordion's focus and animation behavior. Reproduce it by keyboard-tabbing to the header and pressing Enter, then trace the related accordion implementation and tests if available. Done means the focus-visible outline remains visible outside the accordion throughout the animation.

Written by the indexing model from the issue text.