How to use com.gargoylesoftware.htmlunit.html

 HtmlCanvas html = new HtmlCanvas();
html
 .html()
  .body()
    .h1().content("Hello Coder")
  ._body()
 ._html();
System.out.println(html.toHtml());

 WebClient client = new WebClient();
HtmlPage page = client.getPage("http://stackoverflow.com");

// create a submit button - it doesn't work with 'input'
HtmlElement button = page.createElement("button");
button.setAttribute("type", "submit");

// append the button to the form
HtmlElement form = ...;
form.appendChild(button);

// submit the form
page = button.click();

 @Test
public void submittingForm() throws Exception {
  final WebClient webClient = new WebClient();

  // Get the first page
  final HtmlPage page1 = webClient.getPage("http://some_url");

  // Get the form that we are dealing with and within that form, 
  // find the submit button and the field that we want to change.
  final HtmlForm form = page1.getFormByName("myform");

  final HtmlSubmitInput button = form.getInputByName("submitbutton");
  final HtmlTextInput textField = form.getInputByName("userid");

  // Change the value of the text field
  textField.setValueAttribute("root");

  // Now submit the form by clicking the button and get back the second page.
  final HtmlPage page2 = button.click();

  webClient.closeAllWindows();
}

HtmlPage page3;
 page3 = webClient.getPage("Website");
 HtmlForm loginForm = page3.getFormByName("loginForm");
 HtmlTextInput username = loginForm.getInputByName("NameofUsernameElement");
 HtmlPasswordInput pass = loginForm.getInputByName("NameofPassowordElement");
 HtmlSubmitInput b = loginForm.getInputByValue("LoginButtonValue");
 username.setValueAttribute("Actualy Username");
 pass.setValueAttribute("Actual Password");
 HtmlPage page2;
 page2 = b.click();

DomNodeList<DomElement> domNodeList = page.getElementsByTagName("a");
return domNodeList.stream()
      if (domElement.getTextContent().equals("Surge")) {
        System.out.println(domElement.getTextContent());
        return true;
      try {
        webClient.waitForBackgroundJavaScript(500);
        tempPage = domElement.click();
        Thread.sleep(500);
        DomElement surge_url = tempPage.getElementById("surge_url");
        if (surge_url != null) {
          String href = surge_url.getAttribute("href");
          System.out.println(href);

 WebClient client = ...
Page page = client.getPage(url);
HtmlSelect select = (HtmlSelect) page.getElementById(mySelectId);
HtmlOption option = select.getOptionByValue(desiredOptionValue);
select.setSelectedAttribute(option, true);

private ConfigsBean parsePage(HtmlPage page,int id){
  DomNode font = page.getElementById("font"+id);
  if (font == null || !font.asText().equals("可用")){
    return null;
  }
  DomNode host = page.getElementById("host"+id);
  DomNode port = page.getElementById("port"+id);
  DomNode pass = page.getElementById("pass"+id);
  DomNode encrypt = page.getElementById("encrypt"+id);
  ConfigsBean configsBean = new ConfigsBean();
  configsBean.setRemarks(host.asText());
  configsBean.setServer(configsBean.getRemarks());
  configsBean.setServer_port(Integer.parseInt(port.asText()));
  configsBean.setMethod(encrypt.asText());
  configsBean.setPassword(pass.asText());
  configsBean.setObfs("plain");
  configsBean.setId(ModelUtil.generateId());
  return configsBean;
}

/**
 * {@inheritDoc}
 */
@Override
public DomNode cloneNode(final boolean deep) {
  final DomElement clone = (DomElement) super.cloneNode(deep);
  clone.attributes_ = new NamedAttrNodeMapImpl(clone, isAttributeCaseSensitive());
  clone.attributes_.putAll(attributes_);
  return clone;
}

@Override
public void runTest(TestRun run) throws IOException {
  if (++runs == 50) {
    runs = 0;
    cleanUp();
    init();
  }
  try {
    page.set(webClient.get().getPage("about:blank"));
  } catch (IOException e) {
    throw new RuntimeException(e);
  }
  HtmlPage pageRef = page.get();
  pageRef.executeJavaScript(readFile(new File(run.getBaseDirectory(), run.getFileName())));
  boolean decodeStack = Boolean.parseBoolean(System.getProperty(TeaVMTestRunner.JS_DECODE_STACK, "true"));
  File debugFile = decodeStack ? new File(run.getBaseDirectory(), run.getFileName() + ".teavmdbg") : null;
  RhinoResultParser resultParser = new RhinoResultParser(debugFile);
  AsyncResult asyncResult = new AsyncResult();
  Function function = (Function) page.get().executeJavaScript(readResource("teavm-htmlunit-adapter.js"))
      .getJavaScriptResult();
  Object[] args = new Object[] {
      decodeStack ? createStackDecoderFunction(resultParser) : null,
      new NativeJavaObject(function, asyncResult, AsyncResult.class)
  };
  pageRef.executeJavaScriptFunction(function, function, args, page.get());
  resultParser.parseResult((Scriptable) asyncResult.getResult(), run.getCallback());
}

 public static void main(String[] args) throws Exception {
  // turn off htmlunit warnings
  java.util.logging.Logger.getLogger("com.gargoylesoftware.htmlunit").setLevel(java.util.logging.Level.OFF);
  java.util.logging.Logger.getLogger("org.apache.http").setLevel(java.util.logging.Level.OFF);

  WebClient webClient = new WebClient();
  HtmlPage page = webClient.getPage("http://stackoverflow.com");
  System.out.println(page.getTitleText());
}

List<HtmlAnchor> articles = (List<HtmlAnchor>) page.getByXPath("//a[@class='lblentrylink']");

private DomNode getFirstChildElement(final DomNode parent) {
  DomNode node = parent.getFirstChild();
  while (node != null && !isAccepted(node)) {
    node = node.getNextSibling();
  }
  return node;
}

/** {@inheritDoc} */
@Override
public void startDTD(final String name, final String publicId, final String systemId) {
  final DomDocumentType type = new DomDocumentType(page_, name, publicId, systemId);
  page_.setDocumentType(type);
  final Node child;
  child = type;
  page_.appendChild(child);
}

  /**
   * Parsing of the children is done, we can move our children to the content.
   */
  @Override
  protected void onAllChildrenAddedToPage(final boolean postponed) {
    while (getFirstChild() != null) {
      final DomNode child = getFirstChild();
      child.basicRemove();
      domDocumentFragment_.appendChild(child);
    }
  }
}

/**
 * {@inheritDoc}
 */
@Override
public DomAttr getAttributeNodeNS(final String namespaceURI, final String localName) {
  final String qualifiedName = getQualifiedName(namespaceURI, localName);
  if (qualifiedName != null) {
    return attributes_.get(qualifiedName);
  }
  return null;
}

  /**
   * Remove our window also.
   * {@inheritDoc}
   */
  @Override
  public void remove() {
    super.remove();
    getEnclosedWindow().close();
  }
}

  private DomNode getNextDomSibling(final DomNode element) {
    DomNode node = element.getNextSibling();
    while (node != null && !isAccepted(node)) {
      node = node.getNextSibling();
    }
    return node;
  }
}

 LiteralControl jsResource = new LiteralControl();
jsResource.Text = "<script type=\"text/javascript\" src=\"js/mini-template-control.js\"></script>";
Page.Header.Controls.Add(jsResource);

HtmlLink stylesLink = new HtmlLink();
stylesLink.Attributes["rel"] = "stylesheet";
stylesLink.Attributes["type"] = "text/css";
stylesLink.Href = "css/mini-template-control.css";
Page.Header.Controls.Add(stylesLink);

  /**
   * {@inheritDoc}
   */
  @Override
  public DisplayStyle getDefaultStyleDisplay() {
    final HtmlPage page = getHtmlPageOrNull();
    if (page.isQuirksMode() && page.hasFeature(HTMLDEFINITION_INLINE_IN_QUIRKS)) {
      return DisplayStyle.INLINE;
    }
    return super.getDefaultStyleDisplay();
  }
}

/**
 * Creates a new {@link WebWindow} for the new clone.
 * {@inheritDoc}
 */
@Override
public DomNode cloneNode(final boolean deep) {
  final BaseFrameElement clone = (BaseFrameElement) super.cloneNode(deep);
  clone.init();
  return clone;
}