add translucent on ionic header

Author: BenOsodrac

core/src/components.d.ts

@@ -1460,7 +1460,7 @@ export namespace Components {
          */
         "theme"?: "ios" | "md" | "ionic";
         /**
-          * If `true`, the header will be translucent. Only applies when the theme is `"ios"` and the device supports [`backdrop-filter`](https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter#Browser_compatibility).  Note: In order to scroll content behind the header, the `fullscreen` attribute needs to be set on the content.
+          * If `true`, the header will be translucent. Only applies when the theme is `"ios"` or `"ionic"` and the device supports [`backdrop-filter`](https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter#Browser_compatibility).  Note: In order to scroll content behind the header, the `fullscreen` attribute needs to be set on the content.
           * @default false
          */
         "translucent": boolean;
@@ -7369,7 +7369,7 @@ declare namespace LocalJSX {
          */
         "theme"?: "ios" | "md" | "ionic";
         /**
-          * If `true`, the header will be translucent. Only applies when the theme is `"ios"` and the device supports [`backdrop-filter`](https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter#Browser_compatibility).  Note: In order to scroll content behind the header, the `fullscreen` attribute needs to be set on the content.
+          * If `true`, the header will be translucent. Only applies when the theme is `"ios"` or `"ionic"` and the device supports [`backdrop-filter`](https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter#Browser_compatibility).  Note: In order to scroll content behind the header, the `fullscreen` attribute needs to be set on the content.
           * @default false
          */
         "translucent"?: boolean;

core/src/components/header/header.ionic.scss

@@ -17,3 +17,16 @@ ion-toolbar + ion-toolbar {
   --padding-start: #{globals.$ion-space-400};
   --padding-end: #{globals.$ion-space-400};
 }
+
+@supports (backdrop-filter: blur(0)) {
+  .header-background {
+    @include globals.position(0, 0, 0, 0);
+
+    position: absolute;
+
+    backdrop-filter: saturate(180%) blur(globals.$ion-scale-100);
+  }
+  .header-translucent-ionic ion-toolbar {
+    --opacity: 0.7;
+  }
+}

core/src/components/header/header.tsx

@@ -55,7 +55,7 @@ export class Header implements ComponentInterface {
 
   /**
    * If `true`, the header will be translucent.
-   * Only applies when the theme is `"ios"` and the device supports
+   * Only applies when the theme is `"ios"` or `"ionic"` and the device supports
    * [`backdrop-filter`](https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter#Browser_compatibility).
    *
    * Note: In order to scroll content behind the header, the `fullscreen`
@@ -239,7 +239,7 @@ export class Header implements ComponentInterface {
         }}
         {...inheritedAttributes}
       >
-        {theme === 'ios' && translucent && <div class="header-background"></div>}
+        {theme !== 'md' && translucent && <div class="header-background"></div>}
         <slot></slot>
       </Host>
     );