Overview
Wix's editor is more restrictive than Shopify or WooCommerce for direct HTML injection, but inline SVG is still possible via the HTML embed element. The trade-off: less editorial flexibility, more constraint to Wix's component model.
The HTML embed approach
Wix's "Embed Code" element (available in the editor sidebar) lets you paste arbitrary HTML, including inline SVG. Add the element to your page, paste the SVG markup, and the diagram renders. This is the standard path for inline diagrams on Wix.
The catch: each Embed Code element is iframe-isolated by default for some plans. This means search engines crawl the iframe contents but with reduced confidence about how the iframe relates to the surrounding page. For ecommerce SEO this is a meaningful drawback — direct inline SVG (not iframe-wrapped) is better.
For Wix Business and Wix Studio plans, the "Custom Code" injection feature lets you add HTML directly to the page head and body without iframe isolation. This is the better path for diagrams meant to be cited as part of the page content.
Wix-specific gotchas
Wix's editor occasionally re-wraps embedded HTML if you edit it via the visual editor after pasting. To avoid this, set the embed element to "code-only" mode and don't open it in the visual editor again — just edit the HTML directly.
ImageObject schema on Wix requires either the Custom Code injection (for direct schema control) or one of the SEO apps in the Wix App Market. The native Wix SEO tools don't yet support ImageObject schema natively, so plan to handle this manually.
Wix pages can be slower to render large inline SVGs because of the page-builder overhead. For a single diagram per page this is negligible; for many diagrams on one page, consider whether you actually need them all (and consider whether Wix is the right platform for content-heavy pages overall).