# JavaScript and HTML We can include Javascript in an HTML page in one of three ways: ## JavaScript inline In the early days or in very bad practices, once might see JavaScript placed inside HTML tags like this: ```xml Link ``` where the value of the `onClick` attribute would contain Javascript! ## JavaScript encapsulated However, a more contained form of JavaScript would enter via a ` ``` ## JavaScript from an external file Even better, we could place JavaScript in a file like this: ```javascript // app.js const aVariable = true; ``` Then, we would load the file by placing an `src` attribute in the ` ``` This makes for a more modular approach; then, we could even add files from other sources like such: ```xml a page

a page

``` With this, we can reuse code more easily and keep the HTML structure clean and clear! Note two things: * the *order* of the ` ``` ## JavaScript deferred If a ` ... ```