Google Search can process JavaScript (see Google’s JavaScript SEO guidance), yet rendering important content into accessible HTML gives search crawlers and AI retrieval systems a more reliable page to process and reduces dependence on client-side execution. Visibility still depends on crawl access, content quality, authority, structured information and the policies of each search or AI platform.
The technical SEO foundations are set during development rather than layered on afterwards: crawlable HTML, clean and stable URLs, a single canonical per page, metadata declared per route, structured data describing the organisation, the service and the questions a page answers, a semantic heading and content structure, deliberate internal linking, and the performance work described above.
What those foundations make possible is a site that search engines and AI systems can crawl, interpret and represent accurately. Two related disciplines build on them. Answer engine optimisation is about being the source a direct answer is drawn from. Generative engine optimisation is about presenting your organisation, services and expertise so generative AI systems can understand them accurately when they retrieve and synthesise information.
None of this guarantees a ranking, an AI citation, inclusion in an AI answer or a rich result — no agency controls those outcomes. What we control is whether every system is given a clear, accurate page to work from.