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      JavaScript Introduction

      JavaScript Can Change HTML Content

      One of many JavaScript HTML methods is getElementById().

      This example uses the method to “find” an HTML element (with id=”demo”) and changes the element content (innerHTML) to “Hello JavaScript”:

      document.getElementById("demo").innerHTML = "Hello JavaScript";

      JavaScript Can Change HTML Attribute Values

      In this example JavaScript changes the value of the src (source) attribute of an <img> tag:

      JavaScript Can Change HTML Styles (CSS)

      Changing the style of an HTML element, is a variant of changing an HTML attribute:

      document.getElementById("demo").style.fontSize = "35px";
      document.getElementById('demo').style.fontSize = '35px';

      JavaScript Can Hide HTML Elements

      Hiding HTML elements can be done by changing the display style:

      document.getElementById("demo").style.display = "none";
      document.getElementById('demo').style.display = 'none';

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