Fixing A11y issues in screencast (#3594)

Fixing 2 accessibility issues in screencast window:

Refresh button was not reading the role
Close infobar was not providing enough information for narrator.

Author: vidorteg

src/screencast/infobar.ts

@@ -1,57 +1,57 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-import { html, render } from 'lit-html';
-import { createRef, ref } from 'lit-html/directives/ref.js'
-import { styleMap, StyleInfo } from 'lit-html/directives/style-map.js';
-
-interface InfobarProps {
-    message: string;
-}
-
-export default class InfobarComponent {
-    #buttonRef = createRef();
-    #message: string;
-    #container: HTMLElement | undefined;
-
-    constructor(props: InfobarProps, container?: HTMLElement) {
-        this.#message = props.message;
-        this.#container = container;
-        this.#update();
-    }
-
-    #update(styles?: StyleInfo) {
-        let customStyles = styles ?? {
-            display: 'flex'
-        };
-
-        if (!this.#container) {
-            return;
-        }
-        render(this.template(customStyles), this.#container);
-    }
-
-    template(styles: StyleInfo) {
-        return html`
-            <div class="infobar" style=${styleMap(styles)}>
-                <div class="infobar-message">${this.#message}</div>
-                <button class="infobar-close-button" ${ref(this.#buttonRef)} @click=${this.#onClick}></button>
-            </div>
-        `;
-    }
-
-    #onClick = () => {
-        let styles = {
-            display: 'none',
-        } as StyleInfo;
-
-        this.#update(styles);
-    };
-
-    static render(props: InfobarProps, elementId: string) {
-        const currentContainer = document.getElementById(elementId);
-        if (currentContainer) {
-            new InfobarComponent(props, currentContainer);
-        }
-    }
-}
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+import { html, render } from 'lit-html';
+import { createRef, ref } from 'lit-html/directives/ref.js'
+import { styleMap, StyleInfo } from 'lit-html/directives/style-map.js';
+
+interface InfobarProps {
+    message: string;
+}
+
+export default class InfobarComponent {
+    #buttonRef = createRef();
+    #message: string;
+    #container: HTMLElement | undefined;
+
+    constructor(props: InfobarProps, container?: HTMLElement) {
+        this.#message = props.message;
+        this.#container = container;
+        this.#update();
+    }
+
+    #update(styles?: StyleInfo) {
+        let customStyles = styles ?? {
+            display: 'flex'
+        };
+
+        if (!this.#container) {
+            return;
+        }
+        render(this.template(customStyles), this.#container);
+    }
+
+    template(styles: StyleInfo) {
+        return html`
+            <div class="infobar" style=${styleMap(styles)}>
+                <div class="infobar-message">${this.#message}</div>
+                <button role="button" aria-label="Close infobar" class="infobar-close-button" ${ref(this.#buttonRef)} @click=${this.#onClick}></button>
+            </div>
+        `;
+    }
+
+    #onClick = () => {
+        let styles = {
+            display: 'none',
+        } as StyleInfo;
+
+        this.#update(styles);
+    };
+
+    static render(props: InfobarProps, elementId: string) {
+        const currentContainer = document.getElementById(elementId);
+        if (currentContainer) {
+            new InfobarComponent(props, currentContainer);
+        }
+    }
+}