Abhishek Dwivedi
Team Lead, SEO
Google updated its Search documentation on September 22, 2026 to clarify that content added through the CSS content property is not part of the DOM and may not be indexed. This is not a new ranking update, but it exposes a practical risk for websites that use ::before, ::after or CSS-generated labels for meaningful copy. Here is how SEO, design and development teams can audit the issue without removing useful decorative CSS.
Google added a clarification to its developer guidance: text supplied through the CSS content property is not part of the document object model, and Google Search currently ignores it. The guidance says CSS content is suitable for decorative elements but important text may not be indexed. Treat this as a documentation clarification, not evidence of a new penalty or algorithm update. The operational lesson is simple: if a user or search engine needs the words to understand the page, those words should exist in the document markup.
HTML content creates nodes in the DOM. CSS-generated content, commonly added with ::before or ::after, can appear visually without becoming a normal text node in that structure. JavaScript is different: Google can process JavaScript-generated content when its renderer can execute the required resources and the result appears in rendered HTML. That distinction matters. A browser screenshot can look complete while the underlying representation available for indexing, accessibility and automated extraction is incomplete.
Common problem areas include service names added before cards, promotional labels, product availability, pricing qualifiers, button or link labels, step numbers, form instructions, legal disclosures and navigation text. The risk is higher when the base HTML contains an empty element and CSS supplies the only meaningful words. Decorative quotation marks, icons, separators and visual counters can remain in CSS. Business-critical information, crawlable anchor text and content needed to understand a page should not depend on CSS generation alone.
Start with high-value templates such as service pages, product or category pages, landing pages, pricing pages and navigation components. Disable styles and check whether the page still communicates its meaning. In browser developer tools, inspect suspicious ::before and ::after rules and confirm the same words exist as DOM text. Use Search Console URL Inspection to test the live URL and review rendered HTML. Compare source HTML, rendered DOM and visible output. Confirm that important links use real elements with href attributes and descriptive anchor text. Repeat the test across mobile layouts, reusable components and recently redesigned templates.
Move meaningful words into semantic HTML such as headings, paragraphs, labels, buttons and links, then use CSS for presentation. If JavaScript supplies content, make sure Googlebot can access the required resources and that the final text appears in rendered HTML. Server-side rendering or pre-rendering can reduce dependence on delayed client execution, but it is not a substitute for clear semantics. Avoid adding duplicate hidden text solely for search engines. The repaired page should give users, crawlers and assistive technologies the same essential information.
MDN notes that CSS-generated content is not included in the DOM and may also be unavailable to some assistive-technology combinations. Google’s guidance for generative AI search likewise emphasises publicly accessible, crawlable content and sensible semantic HTML. Fixing this issue therefore supports more than traditional rankings: it improves accessibility, content extraction and the quality of the page representation used by search and AI systems. It does not guarantee inclusion in AI answers, but it removes an avoidable technical barrier.
Garage Collective reviews websites at three levels: source HTML, rendered DOM and the experience visible to users. Our workflow maps high-value templates, identifies content supplied only through CSS or fragile client-side rendering, validates crawlable links and then retests the repaired implementation in Search Console. This connects technical SEO with design-system and development decisions instead of treating indexing as a final-launch task. Explore our Enterprise Website Audit, Web Development and AEO and AI Discoverability capabilities, or request a website transformation review.
Primary references: Google Search developer guidance, Google Search documentation update for September 22, 2026, Google JavaScript SEO basics, Google crawlable-link guidance, Google guidance for generative AI search and MDN documentation for the CSS content property. Product behaviour and documentation can change, so recheck the official guidance during future audits.
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