Rendering Difference Engine

Raw HTML and rendered HTML often differ, and this extension shows exactly where. It identifies SEO signals that are added, removed or altered when JavaScript renders a page, without needing to dig through code. Separate tabs cover each factor: crawling, indexing and metadata, headings, links, media and page copy. A Difference tab displays the rendered HTML and highlights what changed, so a reader can judge how search engines crawl, understand and index the URL at a glance. The publisher is The Gray Dot Company Inc., and the extension is filed under developer tools. It examines one page at a time and is built for technical SEO checks where JavaScript rendering could change what search engines see. Each tab shows the exact change for its factor, so reviewing a rendering problem does not require reading source code.