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Issue number: resolves internal --------- <!-- 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. --> Some app functionality (like focus management, keyboard utils, and shimming) are tied to the `ion-app` which requires all Ionic applications to have a root `ion-app` element. ## What is the new behavior? <!-- Please describe the behavior or changes that are being added by this PR. --> `ion-app` specific init functionality is moved to the global `initialize` function ## Does this introduce a breaking change? - [ ] Yes - [x] No <!-- If this introduces a breaking change: 1. Describe the impact and migration path for existing applications below. 2. Update the BREAKING.md file with the breaking change. 3. Add "BREAKING CHANGE: [...]" to the commit description when merging. See https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#footer for more information. --> Although it is not expected that this introduces a breaking change, these changes were introduced on the `next` branch as a precaution. ## Other information <!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. --> NOTE: This is **NOT** a recommended pattern for Ionic applications and was created for a specific internal use case --------- Co-authored-by: Brandy Carney <brandyscarney@users.noreply.github.com>