Data URI
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Spoiler: o conteúdo abaixo não funciona no Internet Explorer.
Em 2005 o Irapuan Martinez falou do Acid 2 e de um recurso interessantíssimo, que acabei de testar: Dat URI (que existe desde 98).
Dat URI, em poucas palavras, é a possibilidade de inserir conteúdo dentro de um arquivo HTML sem a necessidade de linkar o arquivo. Assim, a imagem ao lado poderia ser inserida com: