September 2024
Intermediate to advanced
1128 pages
32h 40m
Spanish
Content preview from CSS: La Guía Definitiva, 5ª Edición
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Capítulo 4. Especificidad, herencia y cascada
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Los capítulos 2 y 3 mostraron cómo la estructura del documento y los selectores CSS te permiten aplicar una amplia variedad de estilos a los elementos. Sabiendo que todo documento válido genera un árbol estructural, puedes crear selectores que se dirijan a los elementos en función de sus ancestros, atributos, elementos hermanos, etc. El árbol estructural es lo que permite que funcionen los selectores y también es fundamental para un aspecto igualmente crucial de CSS: la herencia.
La herencia es el mecanismo por el que algunos valores de propiedad se transmiten de un elemento a otro descendiente. Al determinar qué valores deben aplicarse a un elemento, un agente de usuario debe tener en cuenta no sólo la herencia, sino también la especificidad de las declaraciones, así como el origen de las propias declaraciones. Este proceso de consideración es lo que se conoce como cascada.
Exploraremos la interrelación entre estos tres mecanismos -especificidad, herencia y cascada- en este capítulo. Por ahora, la diferencia entre los dos últimos puede resumirse así: cuando escribimos h1 {color: red; color: blue;}, el <h1> se vuelve azul debido a la cascada, y cualquier <span> dentro del <h1> también se vuelve azul debido a la herencia.
Sobre todo, independientemente de lo abstractas que puedan parecer las cosas, ¡sigue adelante! ...
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