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docs(api.md): add note on page.pdf() color rendering behavior (#2821)

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Adds guidance for producing accurate colors in PDF output. page.pdf() can produce unexpected document colors unless forced to render exact colors.

Fixes #2685
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Kaveet Laxmidas 2018-06-29 11:57:03 -05:00 committed by Andrey Lushnikov
parent 871b204fd1
commit acb89dddba
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@ -1250,6 +1250,8 @@ Page is guaranteed to have a main frame which persists during navigations.
`page.pdf()` generates a pdf of the page with `print` css media. To generate a pdf with `screen` media, call [page.emulateMedia('screen')](#pageemulatemediamediatype) 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('screen')](#pageemulatemediamediatype) 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 ```js
// Generates a PDF with 'screen' media type. // Generates a PDF with 'screen' media type.
await page.emulateMedia('screen'); await page.emulateMedia('screen');