By using our site, you The document object is accessed with:. When an HTML document is loaded into a web browser, it becomes a document object.. Now what I want to do is, I would like to have a checkbox that when it checked, then the button will become active mode. Once you will save, preview, and run the app, you can clear one or all the checkboxes every time (on the same screen) as per your need. Alternatively, click the TypeScript widget on the Status bar and select Configure TypeScript. Suppose you have a file app.ts with the following code: You can keep track of class implementations and overriding methods either using the gutter icons in the editor or pressing the appropriate shortcuts. You need to add a for attribute to the