JS Versions
ECMAScript specifies the language, while browsers and other runtimes supply implementations. Use an explicit compatibility target for a real project.
Where to run this
This example uses the JavaScript console playground. Select Run to execute it; the example does not run on this lesson page.
A practical example
const requirements = ["Syntax", "Built-in methods", "Browser APIs"];
console.log(requirements.join(" + "));
What happens
All three parts need a compatibility decision.