Function takeElementScreenshot

takeElementScreenshot(
    page: any,
    selectorKey: string,
    filename: string,
): Promise<void>
Takes a screenshot of a specific element.
Parameters
- page: any
  The Playwright page object
- selectorKey: string
  The selector key (can be a fixture key or raw CSS selector)
- filename: string
  The filename to save the screenshot as
Returns Promise<void>
Example
```
When I pw take a screenshot of element "header.navbar" as "navbar.png"
```
- Defined in backend/actions/visual.ts:28