HTML 5.3: Browser Implementation Insights

The provided text offers insights into the HTML 5.3 specification, explaining its background, intended audience, scope, and historical development. It details how HTML evolved from a scientific document markup language into a versatile tool for web applications, emphasizing its semantic core and the need for browser implementers to handle diverse content. The document highlights the specification's precision and completeness, which is crucial for interoperability among browsers despite HTML's sometimes inconsistent historical development. Finally, it outlines the complex relationship between the W3C and WHATWG in shaping the HTML Living Standard, underscoring the principles of backward compatibility and alignment between specifications and actual browser implementations.