W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Definition and Usage. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. This reference will cover the properties and methods of the getContext("2d") object, which can be used to draw text, lines, Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. JavaScript (/ d v s k r p t /), often abbreviated as JS, is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS.As of 2022, 98% of websites use JavaScript on the client side for webpage behavior, often incorporating third-party libraries.All major web browsers have a dedicated JavaScript engine to execute the code on Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Before ES6 (2015), JavaScript had only Global Scope and Function Scope. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. The lastIndexOf() method returns the last index (position) of a specified value.. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. The lastIndexOf() method returns -1 if the value is not found.. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. The x declared in the block, in this example, is not the same as the x declared outside the block: Redeclaring a JavaScript var variable is allowed anywhere in a program: Example. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. let viewportX = e.clientX let viewportY = e.clientY // Viewport-relative position of the target element. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. ES6 introduced two important new JavaScript keywords: let and const. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Note: The