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doc: document mocking read-only browser apis (#30122)

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Documents https://github.com/microsoft/playwright/issues/30115
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docs/src/mock-browser-js.md
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@ -60,6 +60,23 @@ test('show battery status', async ({ page }) => {
``` ```
## Mocking read-only APIs
Some APIs are read-only so you won't be able to assign to a navigator property. For example,
```js
// Following line will have no effect.
navigator.cookieEnabled = true;
```
However, if the property is [configurable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty#configurable), you can still override it using the plain JavaScript:
```js
await page.addInitScript(() => {
Object.defineProperty(Object.getPrototypeOf(navigator), 'cookieEnabled', { value: false });
});
```
## Verifying API calls ## Verifying API calls
Sometimes it is useful to check if the page made all expected APIs calls. You can Sometimes it is useful to check if the page made all expected APIs calls. You can