add doc

Signed-off-by: Nesterzhou <ester.zhou@huawei.com>

en/application-dev/ui/ui-ts-components-web.md

+# Web
+
+The **\<Web>** component can be used to display web pages. For details, see [Web API](../reference/arkui-ts/ts-basic-components-web.md).
+
+## Creating a Component
+
+Create a **\<Web>** component in the .ets file under **main/ets/MainAbility/pages**. Then, in the created component, use **src** to specify the web page URI to be referenced, and bind a controller to the component to call the component APIs.
+
+  ```
+  // xxx.ets
+  @Entry
+  @Component
+  struct WebComponent {
+    controller: WebController = new WebController();
+    build() {
+      Column() {
+        Web({ src: 'https://www.example.com', controller: this.controller })
+      }
+    }
+  }
+  ```
+
+## Setting Styles and Attributes
+
+When using the **\<Web>** component, you need to specify the styles and attributes. The sample code is as follows.
+
+```
+// xxx.ets
+@Entry
+@Component
+struct WebComponent {
+  fileAccess: boolean = true;
+  controller: WebController = new WebController();
+  build() {
+    Column() {
+      Text('Hello world!')
+        .fontSize(20)
+      Web({ src: 'https://www.example.com', controller: this.controller })
+        // Set the height and padding.
+        .height(500)
+        .padding(20)
+        // Set the file access permission and script execution permission.
+        .fileAccess(this.fileAccess)
+        .javaScriptAccess(true)
+      Text('End')
+        .fontSize(20)
+    }
+  }
+}
+```
+## Adding Events and Methods
+
+Add the **onProgressChange** event for the **\<Web>** component, which is triggered when the loading progress changes and returns the progress value in its callback. Assign the progress value to the **\<Progress>** component to control the status of the component. When the progress reaches 100%, the **\<Progress>** component is hidden, and the web page loading is complete.
+
+```
+// xxx.ets
+@Entry
+@Component
+struct WebComponent {
+  @State progress: number = 0;
+  @State hideProgress: boolean = true;
+  fileAccess: boolean = true;
+  controller: WebController = new WebController();
+  build() {
+    Column() {
+      Text('Hello world!')
+        .fontSize(20)
+      Progress({value: this.progress, total: 100})
+        .color('#0000ff')
+        .visibility(this.hideProgress ? Visibility.None : Visibility.Visible)
+      Web({ src: 'https://www.example.com', controller: this.controller })
+        .fileAccess(this.fileAccess)
+        .javaScriptAccess(true)
+        .height(500)
+        .padding(20)
+        // Add an onProgressChange event.
+        .onProgressChange(e => {
+          this.progress = e.newProgress;
+          // When the progress reaches 100%, the progress bar disappears.
+          if (this.progress === 100) {
+            this.hideProgress = true;
+          } else {
+            this.hideProgress = false;
+          }
+        })
+      Text('End')
+        .fontSize(20)
+    }
+  }
+}
+```
+Add the **runJavaScript** method to the **onPageEnd** event. The **onPageEnd** event is triggered when the web page finishes loading. In this case, the **runJavaScript** method can be used to execute JavaScript scripts in the HTML file. In the sample code below, when the web page finishes loading, the **onPageEnd** event is triggered to call the **test** method in the HTML file and print information on the console.
+
+```
+// xxx.ets
+@Entry
+@Component
+struct WebComponent {
+  @State progress: number = 0;
+  @State hideProgress: boolean = true;
+  fileAccess: boolean = true;
+  // Define the controller for the \<Web> component.
+  controller: WebController = new WebController();
+  build() {
+    Column() {
+      Text('Hello world!')
+        .fontSize(20)
+      Progress({value: this.progress, total: 100})
+        .color('#0000ff')
+        .visibility(this.hideProgress ? Visibility.None : Visibility.Visible)
+      // Initialize the \<Web> component and bind it to the controller.
+      Web({ src: $rawfile('index.html'), controller: this.controller })
+        .fileAccess(this.fileAccess)
+        .javaScriptAccess(true)
+        .height(500)
+        .padding(20)
+        .onProgressChange(e => {
+          this.progress = e.newProgress;
+          if (this.progress === 100) {
+            this.hideProgress = true;
+          } else {
+            this.hideProgress = false;
+          }
+        })
+        .onPageEnd(e => {
+          // test() is defined in index.html.
+          this.controller.runJavaScript({ script: 'test()' });
+          console.info('url: ', e.url);
+        })
+      Text('End')
+        .fontSize(20)
+    }
+  }
+}
+```
+
+Create an HTML file in **main/resources/rawfile**.
+
+```
+<!-- index.html -->
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<body>
+    Hello world!
+</body>
+<script type="text/javascript">
+  function test() {
+      console.info('Ark Web Component');
+  }
+</script>
+</html>
+```
+## Scenario Example
+
+In this example, you'll implement a **\<Web>** component where videos can be played dynamically. Embed a video resource into an HTML page, and then use the **\<Web>** component controller to invoke the **onActive** and **onInactive** methods to activate and pause page rendering, respectively. When the page is hidden, the **\<Web>** component stops rendering and the video playback pauses. When the page is displayed, the **\<Web>** component is activated and the video playback resumes.
+
+  ```
+  // xxx.ets
+  @Entry
+  @Component
+  struct WebComponent {
+    controller: WebController = new WebController();
+    build() {
+      Column() {
+        Web({ src: $rawfile('index.html'), controller: this.controller })
+        .fileAccess(true)
+      }
+    }
+
+    onPageHide() {
+      // Invoked when the page is hidden.
+      this.controller.onInactive();
+    }
+
+    onPageShow() {
+      // Invoked when the page is displayed.
+      this.controller.onActive();
+    }
+  }
+  ```
+
+  ```
+  <!-- index.html -->
+  <!DOCTYPE html>
+  <html>
+  <meta charset="utf-8">
+  <body>
+      <video width="320" height="240" controls="controls" muted="muted" autoplay="autoplay">
+          <!-- The test.mp4 video file is stored in main/resources/rawfile. -->
+          <source src="test.mp4" type="video/mp4">
+      </video>
+  </body>
+  </html>
+  ```