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Issue number: 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. --> In v7, using the legacy syntax, the height of the highlight on an item could be adjusted using the `--highlight-height` variable. This variable was not added to input and therefore would not work using the modern syntax. ## What is the new behavior? <!-- Please describe the behavior or changes that are being added by this PR. --> Adds the `--highlight-height` variable to `ion-input`, `ion-textarea` and `ion-select` so that developers can customize this height in `md` mode. Since the highlight element is not added for `ios` mode, this variable won't do anything for `ios`. Note that this diverges from the v7 behavior, where setting `--highlight-height` enabled the highlight for `ios`. A design document outlining this has been proposed here: https://github.com/ionic-team/ionic-framework-design-documents/pull/252 ## 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/.github/CONTRIBUTING.md#footer for more information. --> ## Other information <!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. --> --------- Co-authored-by: Brandy Carney <brandyscarney@users.noreply.github.com>