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Sean Perkins 5c2a73b262 chore(playwright): dark mode support (#28593)
Issue number: N/A

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## What is the current behavior?
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Testing dark mode is manual per test in Playwright. Ionic developer
needs to setup the variables and assign them to a selector that applies
in the class.

## What is the new behavior?
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this PR. -->

- The `.setContent` API will now work with a new config option to test
dark mode automatically without additional configuration/test set-up.
- Default theme is no theme (fallback theme)
- Screenshot names and test titles remain the same for all existing
tests. Only tests that opt into a theme will be pre-pended with `-dark`
or `-light` (as an example for current themes).

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->
2023-11-29 20:48:16 +00:00
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