Your JavaScript is using an old function or feature that is 'deprecated.' This means it's no longer recommended for use and could be removed from browsers in the future. Relying on deprecated APIs can cause your site to break unexpectedly as browsers evolve. It's best to update your code to use the modern equivalent.
Using an old, deprecated browser feature.
Consult documentation on sites like the Mozilla Developer Network (MDN) to find the modern replacement for the deprecated API and update your code accordingly.
Using modern APIs ensures your website is future-proof, secure, and performant. It keeps your codebase healthy and aligned with current web standards.
This issue can affect your site's search engine rankings and user experience. Addressing it promptly helps ensure optimal performance and visibility in search results.
Black SEO Analyzer automatically checks for this warning during site analysis, along with hundreds of other technical SEO issues.
Choose the license that fits your needs and start getting the deep, actionable insights you deserve.