This article champions HTML validation as a core skill for building accessible, SEO-friendly, and resilient sites: follow W3C standards, favor semantic structure (header/nav/main/footer), adopt a consistent style, leverage HTML5 (section/article/aside), and validate early with W3C/IDE tools; an e-commerce example shows how semantic product pages and alt text cut bugs, speed delivery, and improve UX.
Validating HTML code is crucial for a robust, accessible, and search engine-friendly website, as invalid code can lead to accessibility issues, cross-browser compatibility problems, and negatively impact SEO. Validation checks syntax errors, semantic errors, and accessibility issues against the official HTML specification.
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