February 17Feb 17 Administrators HTML JavaScript JavaScript makes HTML pages more dynamic and interactive. Example My First JavaScript Click me to display Date and Time The HTML <script> Tag The HTML <script> tag is used to define a client-side script (JavaScript). The <script> element either contains script statements, or it points to an external script file through the src attribute. Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content. To select an HTML element, JavaScript most often uses the document.getElementById() method. This JavaScript example writes "Hello JavaScript!" into an HTML element with id="demo": Example <script> document.getElementById("demo").innerHTML = "Hello JavaScript!"; </script> Tip: You can learn much more about JavaScript in our JavaScript Tutorial. A Taste of JavaScript Here are some examples of what JavaScript can do: Example JavaScript can change content: document.getElementById("demo").innerHTML = "Hello JavaScript!"; Example JavaScript can change styles: document.getElementById("demo").style.fontSize = "25px";document.getElementById("demo").style.color = "red";document.getElementById("demo").style.backgroundColor = "yellow"; Example JavaScript can change attributes: document.getElementById("image").src = "picture.gif"; The HTML <noscript> Tag The HTML <noscript> tag defines an alternate content to be displayed to users that have disabled scripts in their browser or have a browser that doesn't support scripts: Example <script> document.getElementById("demo").innerHTML = "Hello JavaScript!"; </script><noscript>Sorry, your browser does not support JavaScript!</noscript> HTML Script Tags Tag Description <script> Defines a client-side script <noscript> Defines an alternate content for users that do not support client-side scripts For a complete list of all available HTML tags, visit our HTML Tag Reference. Video: HTML and JavaScript
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