fix(header, footer): resolve CSP violations with box shadow (#27560)

Issue number: N/A

---------

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issue. -->

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etc). Submit multiple pull requests if needed. -->

## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

The `ion-header` and `ion-footer` use a base64 encoded image for a box
shadow instead of using the CSS box-shadow property directly. The use of
the background image creates CSP violations. The historic reasoning of
using an image instead of box shadow was to improve scroll performance.
Browsers and devices have improved a lot since that was implemented (5
years ago).

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- Updates the usage of `ion-header` and `ion-footer` to use a box
shadow. The value comes from Material's web implementation:
https://material-components.github.io/material-components-web-catalog/#/component/top-app-bar

## 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. -->

---------

Co-authored-by: ionitron <hi@ionicframework.com>
This commit is contained in:
Sean Perkins
2023-06-06 19:44:59 -04:00
committed by GitHub
parent cb013df7f5
commit e75fa582c4
464 changed files with 16 additions and 42 deletions

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