What is Card title truncation compliance?

Card title truncation compliance is the citation-card sub-property that measures whether the page's title tag renders within the AI search engine's card-title character budget without truncating a load-bearing token. Page titles that render within budget (44–70 characters depending on engine, with mobile budgets running 20–30% shorter than desktop) capture card-surface click-through 1.3–1.5× over titles that truncate mid-word or mid-brand-name. The card composer truncates at a whitespace boundary when the title overflows — a title that overflows and truncates on a space between the brand name and the topic renders as a broken card. Per-engine budgets: Google AI Mode 48 characters, ChatGPT Search 60, Perplexity 55, Microsoft Copilot 44, Amazon Rufus 40 (information-branch), Claude 70. Editorial discipline: front-load the load-bearing token (brand name if the citation is trust-driven, topic if it is intent-driven) in the first 40 characters of the page title on every priority page, and reserve the tail for optional qualifiers the truncation can safely drop.