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Javascript makes the HTML page dynamic , All actions in the page is done by using Javascript.

Usage of Javascript in HTML​

We can add JavaScript directly to our HTML file by writing the code inside the <script> tag. The <script> tag can either be placed inside the <head> or the <body> tag according to the requirement. Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content.

<script>
  document.getElementById("demo").innerHTML = "Hello JavaScript!";
</script>
Example
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JavaScript Can also change the style of elements

Example
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