how to reference id in html code example

Example 1: javascript remove element by id

//removing element by ID
var element = document.getElementById("myElementID");
    element.parentNode.removeChild(element);

Example 2: referance html id css

<style>
  #test {
  /*Styleing here*/
  }
</style>
<h1 id="test"></h1>

Example 3: html id

<style>
#grepperHeader {
  background-color: lightblue;
  color: navy;
  padding: 40px;
  text-align: center;
}
</style>

<h1 id="grepperHeader">grepperHeader</h1>

Example 4: angular read element from html by atribute name

ExecutorService threadpool = Executors.newCachedThreadPool();
Future<Long> futureTask = threadpool.submit(() -> factorial(number));
 
while (!futureTask.isDone()) {
    System.out.println("FutureTask is not finished yet..."); 
} 
long result = futureTask.get(); 
 
threadpool.shutdown();