April 2025
Intermediate to advanced
1128 pages
32h 5m
Portuguese (Portugal, Brazil)
Content preview from CSS: O Guia Definitivo, 5ª Edição
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Capítulo 20. Filtros, mistura, recorte e mascaramento
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Várias propriedades especiais permitem aos autores alterar o aspeto dos elementos com filtros visuais, especificar diferentes formas de misturar visualmente os elementos com o que está por trás deles e alterar a apresentação dos elementos mostrando partes e escondendo outras partes. Embora estes conceitos possam parecer díspares, todos têm uma coisa em comum: permitem que os elementos sejam alterados de formas que anteriormente eram difíceis ou impossíveis.
Filtros CSS
O CSS fornece uma forma de aplicar efeitos de filtro visual incorporados, bem como filtros personalizados definidos na página ou em ficheiros externos, a elementos através da propriedade filter.
A sintaxe do valor permite uma lista de funções de filtro separada por espaços, sendo cada filtro aplicado em sequência. Assim, dada a declaração filter: opacity(0.5) blur(1px);, a opacidade é aplicada ao elemento, e o resultado semitransparente é depois esbatido. ...
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