JS Terminology Explanation

• Browser sniffing (browser sniffing): Gets the name and version of the browser via JS.
• Object detection: Checks whether the user agent supports a certain object and makes it a key distinguishing criterion.
• Document Object Model, DOM: Each browser provides a document that is displayed and manipulated, and is implemented through the Document Object model.
• Progressive Enhancement (Progressive enhancement): a practice that only targets the user-provided functionality that can be seen and used, starting with the lowest common features, and then detecting whether the user supports the ever-increasing features.
  • Start with a valid, semantically correct, (X) HTML containing all the content and a meaningful structure.
  • Add style sheets to improve the look, legibility, and clarity of your structure-even adding a simple scrolling effect to make it more vibrant.
  • Add JavaScript.

• • • The OnLoad event handler function of the Window object enables JavaScript to start when the document is loaded.
    • JavaScript detects whether the current user agent supports the users DOM.
    • Detects if all the elements are available and applies the expected functionality.
• Web accessibility (Accessibility): a practice that allows a website to be used by everyone, regardless of his disability.
  • For example, visually impaired users can use a special software called screen reader to read the contents of a webpage to them.
  • For example, a user with a difficult action can use some tools to control the keyboard and navigate the page.