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Update api.md (#1773)

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@ -1368,13 +1368,13 @@ Page is guaranteed to have a main frame which persists during navigations.
> **NOTE** Generating a pdf is currently only supported in Chromium headless.
`page.pdf()` generates a pdf of the page with `print` css media. To generate a pdf with `screen` media, call [page.emulateMedia({ type: 'screen' })](#pageemulatemediaoptions) before calling `page.pdf()`:
`page.pdf()` generates a pdf of the page with `print` css media. To generate a pdf with `screen` media, call [page.emulateMedia({ media: 'screen' })](#pageemulatemediaoptions) before calling `page.pdf()`:
> **NOTE** By default, `page.pdf()` generates a pdf with modified colors for printing. Use the [`-webkit-print-color-adjust`](https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-print-color-adjust) property to force rendering of exact colors.
```js
// Generates a PDF with 'screen' media type.
await page.emulateMedia({type: 'screen'});
await page.emulateMedia({media: 'screen'});
await page.pdf({path: 'page.pdf'});
```