The Short Version
No credible evidence supports the claim that electronics and appliances comprised 35% of U.S. online retail sales in 2005. The 35% figure traces exclusively to IELTS exam practice materials describing Canadian — not American — online shopping data. The U.S. Census Bureau's 2005 report lists different top categories, and Forrester Research explicitly identified Travel ($63 billion) as the largest U.S. online retail category that year, making a 35% electronics share arithmetically implausible.