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+---
+title: Cascada y herencia
+slug: Web/CSS/Introducción/Cascading_and_inheritance
+translation_of: Learn/CSS/Building_blocks/Cascade_and_inheritance
+---
+<p>{{ CSSTutorialTOC() }}</p>
+
+<p>{{ previousPage("/es/docs/Web/CSS/Introduction/How_CSS_works", "Cómo funciona el CSS.")}}<span id="result_box" lang="es"><span class="hps">Esta</span> <span class="hps">es</span> <span class="hps">la cuarta sección </span> <span class="alt-edited hps">del</span> <span class="hps">tutorial</span><span> <span class="hps">CSS</span> <span class="hps">Primeros pasos</span>;</span> <span class="hps">que</span> <span class="hps">describe cómo</span> <span class="hps">interactúan</span> <span class="hps">las hojas de estilo</span> <span class="hps">en cascada,</span> <span class="hps">y</span> <span class="hps">cómo los elementos</span> <span class="hps">heredan</span> <span class="hps">el estilo</span> <span class="hps">de sus padres.</span> <span class="alt-edited hps">Usted agrega</span> <span class="hps">a</span> <span class="hps">la hoja de estilos</span> <span class="alt-edited hps">de ejemplo,</span> <span class="hps">utilizando la herencia</span> <span class="alt-edited hps">para alterar</span> <span class="hps">el estilo de</span> <span class="alt-edited hps">muchas partes del</span> <span class="hps">documento</span> <span class="hps">en un solo paso</span><span>.</span></span></p>
+
+<h2 class="clearLeft" id="Información_Cascada_y_herencia"><span class="short_text" id="result_box" lang="es"><span class="hps">Información</span><span>:</span> <span class="hps">Cascada</span> <span class="hps">y</span> <span class="hps">herencia</span></span></h2>
+
+<p><span id="result_box" lang="es"><span class="hps">El estilo</span> <span class="hps">final para</span> <span class="hps">un elemento</span> <span class="hps">se puede especificar en</span> <span class="hps">muchos lugares</span> <span class="hps">diferentes</span><span>, que pueden interactuar</span> <span class="hps">de una manera compleja</span><span>.</span> <span class="hps">Esta interacción</span> <span class="hps">compleja</span> <span class="hps">hace</span> <span class="alt-edited hps">el CSS</span> <span class="alt-edited hps">poderoso</span><span>,</span> <span class="alt-edited hps">pero puede también</span> <span class="hps">hacer que sea</span> <span class="hps">confuso y difícil</span> <span class="hps">de depurar.</span></span></p>
+
+<p><span id="result_box" lang="es"><span class="alt-edited hps">Tres</span> <span class="alt-edited hps">principales fuentes de</span> <span class="hps">información de estilo</span> <span class="alt-edited hps">forman</span> <span class="hps">una <em>cascada</em></span><span>.</span> <span class="alt-edited hps">Estas son:</span></span></p>
+
+<ul>
+ <li><span id="result_box" lang="es"><span class="hps">Estilos</span> <span class="hps">por defecto del navegador</span> <span class="hps">para</span> <span class="alt-edited hps">del lenguaje de marcado</span><span>.</span></span></li>
+ <li><span id="result_box" lang="es"><span class="hps">Estilos</span> <span class="hps">especificados</span> <span class="hps">por un usuario</span> <span class="hps">que está leyendo</span> <span class="hps">el documento</span><span>.</span></span></li>
+ <li><span id="result_box" lang="es"><span class="hps">Los</span> <span class="hps">estilos</span> <span class="hps">relacionados en </span><span class="hps">el documento</span> <span class="hps">por su autor</span><span>.</span> <span class="hps">Estos pueden</span> <span class="hps">ser especificados</span> <span class="hps">en tres lugares</span><span>:</span></span>
+  <ul>
+   <li><span id="result_box" lang="es"><span class="hps">En</span> <span class="hps">un archivo externo</span><span>:</span> <span class="hps">este tutorial</span> <span class="alt-edited hps">aborda</span> <span class="hps">principalmente</span> <span class="hps">este</span> <span class="hps">método para definir</span> <span class="hps">los estilos.</span></span></li>
+   <li><span id="result_box" lang="es"><span class="hps">En una definición</span> <span class="hps">al principio</span> <span class="hps">del documento</span><span>: utilice</span> <span class="alt-edited hps">este método únicamente</span> <span class="hps">para los estilos</span> <span class="hps">que se utilizan sólo</span> <span class="hps">en esa página</span> <span class="hps">.</span></span></li>
+   <li><span id="result_box" lang="es"><span class="hps">En un</span> <span class="hps">elemento específico</span> <span class="hps">en el cuerpo</span> <span class="hps">del documento</span><span>:</span> <span class="hps">este</span> <span class="hps">es el método menos</span> <span class="alt-edited hps">fácil de mantener</span><span>,</span> <span class="hps">pero puede ser utilizado</span> <span class="alt-edited hps">para la probar.</span></span></li>
+  </ul>
+ </li>
+</ul>
+
+<p><span id="result_box" lang="es"><span class="hps">El estilo del</span> <span class="hps">usuario modifica</span> <span class="hps">el estilo</span> <span class="hps">por defecto del navegador</span><span>.</span> <span class="alt-edited hps">El estilo</span> <span class="hps">del autor del documento</span> <span class="alt-edited hps">a continuación</span> <span class="hps">modifica</span> <span class="hps">el estilo</span> <span class="hps">un poco más.</span> <span class="hps">En este tutorial,</span> <span class="hps">usted es el autor</span> <span class="hps">del documento</span> <span class="alt-edited hps">de ejemplo,</span> <span class="hps">y</span> <span class="hps">solo trabaja</span> <span class="hps">con</span> <span class="hps">hojas de estilo</span> <span class="hps">del autor</span><span>.</span></span></p>
+
+<div class="tuto_example">
+<div class="tuto_type">Ejemplo</div>
+
+<p><span id="result_box" lang="es"><span class="hps">Cuando lea este</span> <span class="hps">documento en un navegador</span><span>,</span> <span class="hps">parte del estilo</span> <span class="alt-edited hps">que ves</span> <span class="alt-edited hps">proviene</span> <span class="alt-edited hps">por defecto</span> <span class="hps">de su</span> <span class="alt-edited hps">navegador de</span> <span class="hps">HTML</span><span>.</span></span></p>
+
+<p><span id="result_box" lang="es"><span class="hps">Parte del</span> <span class="hps">estilo</span> <span class="hps">podría venir de</span> <span class="alt-edited hps">los ajustes </span></span><span id="result_box" lang="es"><span class="hps">personalizados </span></span><span id="result_box" lang="es"><span class="alt-edited hps">del navegador</span> <span class="hps">o</span> <span class="alt-edited hps">de un archivo</span> <span class="alt-edited hps">de definición de estilo</span> <span class="hps">personalizado.</span> <span class="hps">En Firefox</span><span>, la configuración</span> <span class="hps">se puede personalizar en</span> <span class="alt-edited hps">cuadro de diálogo Preferencias</span><span>, o puede</span> <span class="hps">especificar</span> <span class="hps">estilos</span> <span class="hps">en un archivo</span> </span><span id="result_box" lang="es"><span class="alt-edited hps">denominado</span> </span><span id="result_box" lang="es"><em><code><span class="hps">user Content.css,</span></code></em> <span class="alt-edited hps">archivado </span><span class="hps">en su perfil de</span> <span class="hps">navegador.</span></span></p>
+
+<p><span id="result_box" lang="es"><span class="hps">Parte del</span> <span class="alt-edited hps">estilo</span> <span class="hps">proviene de</span> <span class="hps">las hojas de estilo</span> <span class="hps">vinculadas al</span> <span class="hps">documento</span> <span class="hps">por el servidor</span></span> wiki.</p>
+</div>
+
+<p><span id="result_box" lang="es"><span class="hps">Al abrir su</span> <span class="hps">documento de muestra</span> <span class="hps">en el navegador,</span> <span class="atn hps">los elementos </span></span>{{ HTMLElement("strong") }}<span lang="es"> <span class="alt-edited hps">son</span> <span class="alt-edited hps">más relevante que</span> <span class="hps">el</span> <span class="hps">resto del texto</span><span>.</span> <span class="alt-edited hps">Esto viene del</span> <span class="hps">estilo por defecto</span> <span class="hps">del navegador</span> <span class="hps">para HTML</span><span>.</span></span></p>
+
+<p><span id="result_box" lang="es"><span class="atn hps">El elemento </span></span>{{ HTMLElement("strong") }}<span lang="es"> <span class="hps">son rojos.</span> <span class="alt-edited hps">Esto viene</span> <span class="alt-edited hps">de la</span> <span class="hps">propia hoja de estilos</span> <span class="alt-edited hps">de ejemplo.</span></span></p>
+
+<p><span id="result_box" lang="es"><span class="atn hps">El elemento </span></span>{{ HTMLElement("strong") }}<span lang="es"> <span class="hps">también</span> <span class="hps">heredan</span> <span class="hps">gran parte del estilo del elemento </span></span>{{ HTMLElement("p") }}<span lang="es"><span class="hps">,</span> <span class="alt-edited hps">porque ellos son</span> <span class="hps">sus</span> <span class="hps">hijos.</span> <span class="hps">De la misma manera</span><span>,</span> <span class="alt-edited hps">los</span> elementos </span>{{ HTMLElement("p") }}<span lang="es"> <span class="alt-edited hps">heredan</span> <span class="hps">gran parte del estilo</span> <span class="hps">del</span> <span class="hps">elemento</span></span>{{ HTMLElement("body") }}<span lang="es"><span>.</span></span></p>
+
+<p><span id="result_box" lang="es"><span class="hps">Para los estilos</span> <span class="alt-edited hps">en cascada</span><span class="alt-edited">, las hojas de estilo</span> <span class="hps">del autor</span> <span class="hps">tienen</span> <span class="alt-edited hps">prioridad, </span> <span class="alt-edited hps">ante las hojas de estilo</span> <span class="hps">del lector</span><span>, </span> <span class="hps">por defecto</span> <span class="hps">de tu navegador</span><span>.</span></span></p>
+
+<p><span id="result_box" lang="es"><span class="hps">Para los estilos</span> <span class="hps">heredados</span><span>,</span> <span class="hps">el estilo propio de</span> <span class="hps">un nodo</span> <span class="hps">hijo tiene</span> <span class="hps">prioridad sobre</span> <span class="alt-edited hps">estilo</span> <span class="hps">heredado de</span> <span class="hps">su</span> <span class="hps">padre</span><span>.</span></span></p>
+
+<p><span id="result_box" lang="es"><span class="hps">Estas no son las</span> <span class="hps">únicas prioridades</span> <span class="hps">que se aplican</span><span>.</span> <span class="alt-edited hps">En una página posterior</span><span class="alt-edited hps"> de este</span> <span class="hps">tutorial se explica</span> <span class="alt-edited hps">mas detalladamente</span><span>.</span></span></p>
+
+<div class="tuto_details">
+<div class="tuto_type"><span id="result_box" lang="es"><span class="alt-edited hps">Más</span> <span class="hps">detalles</span></span></div>
+
+<p><span id="result_box" lang="es"><span class="alt-edited hps">El CSS</span> <span class="hps">también proporciona</span> <span class="hps">una forma para que</span> <span class="hps">el lector</span> <span class="alt-edited hps">pueda anular</span> <span class="hps">el estilo</span> <span class="hps">del autor del documento</span><span>,</span> <span class="hps">mediante el uso de</span> <span class="hps">la palabra clave</span><span>! </span></span><code>!important</code>.</p>
+
+<p><span id="result_box" lang="es"><span class="hps">Esto significa</span> <span class="hps">que, como</span> <span class="hps">autor del documento</span><span>,</span> <span class="hps">no siempre se puede</span> <span class="hps">predecir con exactitud</span> <span class="hps">lo que sus lectores</span> <span class="hps">van a ver.</span></span></p>
+
+<p><span id="result_box" lang="es"><span class="hps">Si</span> <span class="hps">quieres conocer</span> <span class="hps">todos los detalles de</span></span> cascada y herencia mira <a class="external" href="http://www.w3.org/TR/CSS21/cascade.html">Asignando propiedad de valores, cascada, y herencia</a> <span id="result_box" lang="es"><span class="hps">en</span> <span class="alt-edited hps">las</span> <span class="hps">especificaciones</span> d<span class="alt-edited hps">el CSS</span><span>.</span></span></p>
+</div>
+
+<h2 id="Acción_El_uso_de_la_herencia"><span class="short_text" id="result_box" lang="es"><span class="hps">Acción</span><span>: El uso de</span> <span class="hps">la herencia</span></span> </h2>
+
+<ol>
+ <li><span id="result_box" lang="es"><span class="hps">Edite su archivo</span> <span class="alt-edited hps"> CSS</span> <span class="alt-edited hps">de ejemplo.</span></span></li>
+ <li><span id="result_box" lang="es"><span class="alt-edited hps">Agrega</span> <span class="hps">esta línea</span> <span class="hps">copiando y</span> <span class="hps">pegando</span><span>.</span> <span class="hps">Realmente no</span> <span class="hps">importa si</span> <span class="hps">usted la agrega</span> <span class="hps">por encima o por</span> <span class="hps">debajo de la línea</span> <span class="hps">que está</span><span>.</span> <span class="alt-edited hps">Sin embargo, añadirla</span> <span class="hps">en la parte superior</span> <span class="hps">es más</span> <span class="hps">lógico, porque</span> <span class="hps">en el documento </span><span class="alt-edited hps">el</span> elemento </span>{{ HTMLElement("p") }}<span lang="es"> es el <span class="alt-edited hps">elemento</span> <span class="hps">padre</span> <span class="atn hps">del elemento  </span></span>{{ HTMLElement("strong") }}<span lang="es"> <span>:</span></span>
+  <pre class="brush:css">p {color: blue; text-decoration: underline;}
+</pre>
+ </li>
+ <li>Ahora actualice el navegador para ver el efecto <span id="result_box" lang="es"><span class="hps">en su</span> <span class="hps">documento de muestra.</span></span> El subrayado afecta todo el texto en el párrafo, incluido las letras iniciales. Los elementos {{ HTMLElement("strong") }} <span id="result_box" lang="es"><span class="hps">han heredado</span> <span class="hps">el estilo</span> <span class="hps">subrayado</span> <span class="hps">de su elemento padre </span></span>{{ HTMLElement("p") }}.<br>
+
+  <p><span id="result_box" lang="es"><span class="hps">Pero</span> <span class="atn hps">los elementos </span></span>{{ HTMLElement("strong") }}<span lang="es"> <span class="hps">siguen siendo</span> <span class="hps">rojo.</span> <span class="hps">El color rojo</span> <span class="hps">es</span> <span class="hps">su estilo</span><span> </span><span class="hps">propio</span><span>,</span> <span class="hps">por lo que tiene</span> <span class="hps">prioridad sobre</span> <span class="hps">el color azul</span> <span class="hps">de su elemento</span> <span class="hps">padre</span> </span>{{ HTMLElement("p") }}<span lang="es"> <span>.</span></span></p>
+ </li>
+</ol>
+
+<table style="background-color: #f4f4f4; border: 1px solid #3366bb; padding: 1em;">
+</table>
+
+<table style="border: 2px outset #3366bb; margin-right: 2em; padding: 1em;">
+ <caption>Antes</caption>
+ <tbody>
+  <tr>
+   <td><strong style="color: red;">C</strong>ascading <strong style="color: red;">S</strong>tyle <strong style="color: red;">S</strong>heets</td>
+  </tr>
+ </tbody>
+</table>
+
+<table style="border: 2px outset #3366bb; padding: 1em;">
+ <caption>Después</caption>
+ <tbody>
+  <tr>
+   <td style="color: blue; text-decoration: underline;"><strong style="color: red;">C</strong>ascading <strong style="color: red;">S</strong>tyle <strong style="color: red;">S</strong>heets</td>
+  </tr>
+ </tbody>
+</table>
+
+<div class="tuto_example">
+<div class="tuto_type"><span id="result_box" lang="es"><span class="alt-edited hps">Problema</span></span></div>
+<span id="result_box" lang="es"><span class="hps">Cambie su</span> hoja de <span class="hps">estilo</span> <span class="hps">de manera que</span> <span class="alt-edited hps">aparecen subrayados</span> <span class="hps">sólo las letras</span> <span class="hps">rojas</span><span>:</span></span>
+
+<table style="border: 2px outset #3366bb; padding: 1em;">
+ <tbody>
+  <tr>
+   <td style="color: blue;"><strong style="color: red; text-decoration: underline;">C</strong>ascading <strong style="color: red; text-decoration: underline;">S</strong>tyle <strong style="color: red; text-decoration: underline;">S</strong>heets</td>
+  </tr>
+ </tbody>
+</table>
+
+<div class="tuto_details" id="tutochallenge">
+<div class="tuto_type">Possible solution</div>
+
+<p>Move the declaration for underlining from the rule for {{ HTMLElement("p") }} to the one for {{ HTMLElement("strong") }}. The resulting file looks like this:</p>
+
+<pre class="brush: css">p {color: blue; }
+strong {color: red; text-decoration: underline;}
+</pre>
+
+<p> </p>
+<a class="hideAnswer" href="#challenge">Hide solution</a></div>
+<a href="#tutochallenge" title="Display a possible solution for the challenge">Ver una solución al desafío.</a></div>
+
+<h2 id="¿Y_ahora_qué"><span class="short_text" id="result_box" lang="es"><span class="hps">¿Y ahora qué</span><span>?</span></span></h2>
+
+<p>{{ nextPage("/en-US/docs/Web/Guide/CSS/Getting_Started/Selectors", "Selectores")}}<span id="result_box" lang="es"><span class="hps">Su</span> <span class="hps">hoja de estilo</span> <span class="hps">de ejemplo especifica</span> <span class="hps">estilos</span> <span class="hps">para las etiquetas</span> <span class="atn hps">&lt;</span><span>p</span><span>&gt;</span> <span class="hps">y</span> <span class="hps">&lt;strong</span><span>&gt;</span><span>, cambiando el</span> <span class="hps">estilo de</span> <span class="hps">los elementos correspondientes</span> <span class="hps">en todo el documento</span><span>.</span> <span class="hps">La</span> <span class="hps">siguiente sección</span> <span class="hps">describe cómo especificar</span> <span class="hps">el estilo</span> <a href="/en-US/docs/Web/Guide/CSS/Getting_Started/Selectors">de manera más selectiva</a></span>.</p>