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Issue number: N/A --------- <!-- Please do not submit updates to dependencies unless it fixes an issue. --> <!-- Please try to limit your pull request to one type (bugfix, feature, etc). Submit multiple pull requests if needed. --> ## What is the current behavior? <!-- Please describe the current behavior that you are modifying. --> 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? <!-- Please describe the behavior or changes that are being added by 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 <!-- If this introduces a breaking change, please describe the impact and migration path for existing applications below. --> ## Other information <!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. -->