fix(mock-doc): overwrite parentElement in MockHTMLElement to return null

src/mock-doc/event.ts

@@ -39,6 +39,10 @@ export class MockEvent {
     this.cancelBubble = true;
   }
 
+  /**
+   * @ref https://developer.mozilla.org/en-US/docs/Web/API/Event/composedPath
+   * @returns a composed path of the event
+   */
   composedPath(): MockElement[] {
     const composedPath: MockElement[] = [];
 
@@ -54,7 +58,16 @@ export class MockEvent {
         break;
       }
 
-      currentElement = currentElement.parentElement;
+      /**
+       * bubble up the parent chain until we arrive to the HTML element. Here we continue
+       * with the document object instead of the parent element since the parent element
+       * is `null` for HTML elements.
+       */
+      if (currentElement.parentElement == null && currentElement.tagName === 'HTML') {
+        currentElement = currentElement.ownerDocument;
+      } else {
+        currentElement = currentElement.parentElement;
+      }
     }
 
     return composedPath;
@@ -202,6 +215,8 @@ function triggerEventListener(elm: any, ev: MockEvent) {
 
   if (elm.nodeName === NODE_NAMES.DOCUMENT_NODE) {
     triggerEventListener((elm as MockDocument).defaultView, ev);
+  } else if (elm.parentElement == null && elm.tagName === 'HTML') {
+    triggerEventListener(elm.ownerDocument, ev);
   } else {
     triggerEventListener(elm.parentElement, ev);
   }

src/mock-doc/node.ts

@@ -1101,6 +1101,19 @@ export class MockHTMLElement extends MockElement {
     this.nodeName = value;
   }
 
+  /**
+   * A node’s parent of type Element is known as its parent element.
+   * If the node has a parent of a different type, its parent element
+   * is null.
+   * @returns MockElement
+   */
+  override get parentElement() {
+    if (this.nodeName === 'HTML') {
+      return null;
+    }
+    return super.parentElement;
+  }
+
   override get attributes(): MockAttributeMap {
     if (this.__attributeMap == null) {
       const attrMap = createAttributeProxy(true);

src/mock-doc/test/element.spec.ts

@@ -444,6 +444,13 @@ describe('element', () => {
     });
   });
 
+  describe('parentElement', () => {
+    it('returns `null` for when accessing the parent element of an html node', () => {
+      const element = new MockHTMLElement(doc, 'myElement');
+      expect(element.parentElement).toEqual(null);
+    });
+  });
+
   describe('input', () => {
     it('list is readonly prop', () => {
       const input = doc.createElement('input');

src/runtime/test/style.spec.tsx

@@ -5,7 +5,11 @@ describe('style', () => {
   it('get style string', async () => {
     @Component({
       tag: 'cmp-a',
-      styles: `div { color: red; }`,
+      styles: `
+        div {
+          color: red;
+        }
+      `,
     })
     class CmpA {
       render() {
@@ -20,13 +24,17 @@ describe('style', () => {
     });
 
     expect(root).toHaveClass('hydrated');
-    expect(styles.get('sc-cmp-a')).toBe(`div { color: red; }`);
+    expect(styles.get('sc-cmp-a')).toContain(`color: red;`);
   });
 
   it('applies the nonce value to the head style tags', async () => {
     @Component({
       tag: 'cmp-a',
-      styles: `div { color: red; }`,
+      styles: `
+        div {
+          color: red;
+        }
+      `,
     })
     class CmpA {
       render() {

test/end-to-end/src/state-cmp/state-cmp.tsx

@@ -3,8 +3,13 @@ import { Component, State, h } from '@stencil/core';
 @Component({
   tag: 'state-cmp',
   styles: `
-    button { color: black; }
-    .selected { font-weight: bold; color: blue; }
+    button {
+      color: black;
+    }
+    .selected {
+      font-weight: bold;
+      color: blue;
+    }
   `,
   shadow: true,
 })

test/karma/test-app/attribute-host/cmp.tsx

@@ -3,19 +3,19 @@ import { Component, State, h } from '@stencil/core';
 @Component({
   tag: 'attribute-host',
   styles: `
-    [color=lime] {
+    [color='lime'] {
       background: lime;
     }
     section::before {
       content: attr(content);
     }
-    [padding=true] {
+    [padding='true'] {
       padding: 50px;
     }
     [margin] {
       margin: 50px;
     }
-    [bold=true] {
+    [bold='true'] {
       font-weight: bold;
     }
   `,

test/karma/test-app/listen-jsx/cmp.tsx

@@ -4,13 +4,14 @@ import { Component, Listen, State, h } from '@stencil/core';
   tag: 'listen-jsx',
   scoped: true,
   styles: `
-  :host{
-    background: black;
-    display: block;
-    color: white;
-    width: 100px;
-    height: 100px;
-  }`,
+    :host {
+      background: black;
+      display: block;
+      color: white;
+      width: 100px;
+      height: 100px;
+    }
+  `,
 })
 export class AttributeBasic {
   @State() wasClicked = '';