All JavaScript programming happens in an environment like a web browser, Node, or Bun.js. Each of these environments has its own set of pre-defined variables like window and console.

Chrome also supports using these new custom variables in JavaScript without any issues. CSS variables are very new though have been in the works for years — but they’re not widely supported yet.

JavaScript vulnerabilities are on the rise in India with the entry of HTML5 and faster JavaScript engines. Here are some key problem areas along with antidotes.