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Then copy the JavaScript code from HTML to Javascirpt. To use JavaScript file rather than script inside HTML, we first create a JavaScript file called “myjs.js” in the same folder. Using Javascript file instead of internal script

This will let HTML display such texts in corresponding elements. In this script, we select the element with tag name ‘h1’ and ‘p’ using document.getElementsByTagName() and then input text “Hello I’m Header” and “I’m Passage”. The tag tells HTML the code inside this block is Javascript. Var headers = document.getElementsByTagName( "h1") Then we put Javascript into HTML directly 1 Write a HTML fileįirst, we write an empty HTML file with title “Demo” and empty content for passage and heading 1 To start with, Let’s create a folder that will contain all HTML, CSS, JavaScript files we will create. It can calculate, manipulate and validate dataĬombining HTML, CSS, JavaScript for a webpage It can update and change both HTML and CSS. JavaScript: JavaScript is the Programming Language for the Web. It describes how HTML elements are to be displayed. Elements in HTML are the building blocks of HTML pages, represented by tagsĬSS: it stands for Cascading Style Sheets. It is the standard markup language for Web pages. HTML: HTML stands for Hyper Text Markup Language. Then D3.js, a javascript package for data visualization is introduced and applied to visualize some simple data.

This passage simply introduces how to combine HTML, CSS and Javascript together to design a web page.