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 5. Valores e unidades
Este trabalho foi traduzido com recurso a IA. Agradecemos o teu feedback e comentários: translation-feedback@oreilly.com
Neste capítulo, vamos abordar caraterísticas que são a base de quase tudo o que podes fazer com CSS: as unidades que afectam as cores, distâncias e tamanhos de uma série de propriedades, bem como as unidades que ajudam a definir esses valores. Sem unidades, não poderias declarar que uma imagem deve ter 10 pixels de espaço em branco à sua volta, ou que o texto de um cabeçalho deve ter um determinado tamanho. Ao compreenderes os conceitos aqui apresentados, poderás aprender e usar o resto do CSS muito mais rapidamente.
Palavras-chave, cadeias de caracteres e outros valores de texto
Tudo numa folha de estilo é texto, mas certos tipos de valores representam diretamente cadeias de texto em vez de, digamos, números ou cores. Incluídos nesta categoria estão os URLs e, curiosamente, as imagens.
Palavras-chave
Para aqueles momentos em que um valor precisa de ser descrito com uma palavra de algum tipo, o CSS tem palavras-chave. Um exemplo comum é a palavra-chave none, que é diferente de 0 (zero). Assim, para remover o sublinhado dos links num documento HTML, escreverias oseguinte:
a[href]{text-decoration:none;}
Da mesma forma, se quiseres forçar os sublinhados nas ligações, utilizarás a palavra-chave underline em vez de none.
Se uma propriedade aceitar palavras-chave, as suas palavras-chave serão definidas apenas para o âmbito dessa propriedade. ...
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