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how work html,css and javascript together?

html :

  • CONTENT LAYER . html files
  • HTML gives the page structure and adds semantics. #html+ css:
  • content+ PRESENTATIO .html file+.css file
  • css enhance how the HTML content is presented (backgrounds, borders, box dimensions, colors, fonts)

html+css+ java script:

  • BEHAVIOR LAYER
  • .html file+.css file+.js file
  • adding interactivitely the website

basic java script:

var:

  • var today= new Date();
  • var hourNow = today.getHours();
  • var greeting;

if

if (hourNow > 18) {

greeting= 'Good evening!'; else if (hourNow > 12) { greeting = ' Good afternoon!'; else if (hourNow > 0) { greeting = 'Good morni ng!'; else { greeting = 'Welcome! ' ; }

LINKING TO A JAVASCRIPT file with html ?

  • <script src="js/ add-content.js">

datatpe in java script :

  • NUMERIC DATA TYP
  • string data type
  • boolean data type