In this article, we’ll build a simple web tool to explore how Text-to-Speech (TTS) works in JavaScript. We’ll also dive into the logic of sentence-level highlighting. These two features are often combined to create accessible, dynamic reading experiences in the browser.
We’ll go step-by-step:
Learn how TTS works in the browser Explore how to highlight sentences dynamically Build a working mini tool with HTML, CSS, and JavaScript (Demo & Code)
📢 What is TTS in the browser?
JavaScript provides built-in support for speech synthesis using the SpeechSynthesis API. It allows us to speak text out loud using voices available in the system.
Core objects:
speechSynthesis — controller to play, pause, stop, and resume speech
— controller to play, pause, stop, and resume speech SpeechSynthesisUtterance — represents the text that will be spoken
✨ Simple example:
js Copy Copied! 1 2 const msg = new SpeechSynthesisUtterance("Hello, world!"); window.speechSynthesis.speak(msg);
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