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diff --git a/files/pt-br/web/css/attr/index.html b/files/pt-br/web/css/attr/index.html new file mode 100644 index 0000000000..43ac460a6f --- /dev/null +++ b/files/pt-br/web/css/attr/index.html @@ -0,0 +1,214 @@ +--- +title: attr +slug: Web/CSS/attr +tags: + - CSS + - Esquema + - Função CSS + - Internet + - Laioute + - Rede + - Referencia + - Web +translation_of: Web/CSS/attr() +original_slug: Web/CSS/attr() +--- +<div>{{CSSRef}}</div> + +<p>A função <strong><code>attr()</code></strong> do <a href="/en-US/docs/Web/CSS">CSS</a> é utilizada para se obter o valor de um determinado atributo do elemento selecionado e usá-lo na folha de estilo. Também pode ser utilizado em <a href="/en-US/docs/Web/CSS/Pseudo-elements">pseudo-elementos</a>, nesse caso o valor do atributo no pseudo-elemento do elemento original é retornado.</p> + +<pre class="brush: css no-line-numbers notranslate">/* Uso Simples */ +attr(data-count); +attr(title); + +/* Com o tipo */ +attr(src url); +attr(data-count number); +attr(data-width px); + +/* Com fallback */ +attr(data-count number, 0); +attr(src url, ''); +attr(data-width px, inherit); +attr(data-something, 'default'); +</pre> + +<div class="note"> +<p><strong>Nota:</strong> A função <code>attr()</code> pode ser utilizada com qualquer propriedade CSS, mas o suporte para propriedades que não sejam {{cssxref("content")}} é experimental.</p> +</div> + +<h2 id="Sintaxe">Sintaxe</h2> + +<h3 id="Valores">Valores</h3> + +<dl> + <dt><code>nome-do-atributo</code></dt> + <dd>É o nome do atributo HTML do elemento referenciado no CSS.</dd> + <dt><code><tipo-ou-unidade></code> {{experimental_inline}}</dt> + <dd>É uma palavra-chave representando tanto o tipo quanto o valor do atributo, ou sua unidade, assim como no HTML alguns atributos tem unidades implícitas. Se o uso de <code><tipo-ou-unidade></code> como um valor para determinado atributo for inválido, a expressão <code>attr()</code> será inválida também. Se omitida, o padrão será <code>string</code>. A lista de valores válidos é: + <table class="standard-table"> + <thead> + <tr> + <th scope="col">Palavra-chave</th> + <th scope="col">Tipo Associado</th> + <th scope="col">Comentário</th> + <th scope="col">Valor Padrão</th> + </tr> + </thead> + <tbody> + <tr> + <td><code>string</code></td> + <td>{{cssxref("<string>")}}</td> + <td>O valor do atributo é tratado como um CSS {{cssxref("<string>")}}. NÃO será reparado, e em particular os caracteres usados .</td> + <td>An empty string.</td> + </tr> + <tr> + <td><code>cor</code> {{experimental_inline}}</td> + <td>{{cssxref("<color>")}}</td> + <td>O valor do atributo é analisado como hash (3- ou 6-valores hash) ou a palavra-chave. Precisa ser um valor {{cssxref("<string>")}} CSS válido.<br> + Os espaços do lead e trail são retirados.</td> + <td><font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">corAtual</span></font></td> + </tr> + <tr> + <td><code>url</code> {{experimental_inline}}</td> + <td>{{cssxref("<url>")}}</td> + <td>The attribute value is parsed as a string that is used inside a CSS <code>url()</code>function.<br> + Relative URL are resolved relatively to the original document, not relatively to the style sheet.<br> + Leading and trailing spaces are stripped.</td> + <td>The url <code>about:invalid</code> that points to a non-existent document with a generic error condition.</td> + </tr> + <tr> + <td><code>integer</code> {{experimental_inline}}</td> + <td>{{cssxref("<integer>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<integer>")}}. If it is not valid, that is not an integer or out of the range accepted by the CSS property, the default value is used.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0</code>, or, if <code>0</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>number</code> {{experimental_inline}}</td> + <td>{{cssxref("<number>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<number>")}}. If it is not valid, that is not a number or out of the range accepted by the CSS property, the default value is used.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0</code>, or, if <code>0</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>length</code> {{experimental_inline}}</td> + <td>{{cssxref("<length>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<length>")}} dimension, that is including the unit (e.g. <code>12.5em</code>). If it is not valid, that is not a length or out of the range accepted by the CSS property, the default value is used.<br> + If the given unit is a relative length, <code>attr()</code>computes it to an absolute length.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0</code>, or, if <code>0</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>em</code>, <code>ex</code>, <code>px</code>, <code>rem</code>, <code>vw</code>, <code>vh</code>, <code>vmin</code>, <code>vmax</code>, <code>mm</code>, <code>cm</code>, <code>in</code>, <code>pt</code>, or <code>pc</code> {{experimental_inline}}</td> + <td>{{cssxref("<length>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<number>")}}, that is without the unit (e.g. <code>12.5</code>), and interpreted as a {{cssxref("<length>")}} with the specified unit. If it is not valid, that is not a number or out of the range accepted by the CSS property, the default value is used.<br> + If the given unit is a relative length, <code>attr()</code>computes it to an absolute length.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0</code>, or, if <code>0</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>angle</code> {{experimental_inline}}</td> + <td>{{cssxref("<angle>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<angle>")}} dimension, that is including the unit (e.g. <code>30.5deg</code>). If it is not valid, that is not an angle or out of the range accepted by the CSS property, the default value is used.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0deg</code>, or, if <code>0deg</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>deg</code>, <code>grad</code>, <code>rad</code> {{experimental_inline}}</td> + <td>{{cssxref("<angle>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<number>")}}, that is without the unit (e.g. <code>12.5</code>), and interpreted as an {{cssxref("<angle>")}} with the specified unit. If it is not valid, that is not a number or out of the range accepted by the CSS property, the default value is used.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0deg</code>, or, if <code>0deg</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>time</code> {{experimental_inline}}</td> + <td>{{cssxref("<time>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<time>")}} dimension, that is including the unit (e.g. <code>30.5ms</code>). If it is not valid, that is not a time or out of the range accepted by the CSS property, the default value is used.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0s</code>, or, if <code>0s</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>s</code>, <code>ms</code> {{experimental_inline}}</td> + <td>{{cssxref("<time>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<number>")}}, that is without the unit (e.g. <code>12.5</code>), and interpreted as an{{cssxref("<time>")}} with the specified unit. If it is not valid, that is not a number or out of the range accepted by the CSS property, the default value is used.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0s</code>, or, if <code>0s</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>frequency</code> {{experimental_inline}}</td> + <td>{{cssxref("<frequency>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<frequency>")}} dimension, that is including the unit (e.g. <code>30.5kHz</code>). If it is not valid, that is not a frequency or out of the range accepted by the CSS property, the default value is used.</td> + <td><code>0Hz</code>, or, if <code>0Hz</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>Hz</code>, <code>kHz</code> {{experimental_inline}}</td> + <td>{{cssxref("<frequency>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<number>")}}, that is without the unit (e.g. <code>12.5</code>), and interpreted as a {{cssxref("<frequency>")}} with the specified unit. If it is not valid, that is not a number or out of the range accepted by the CSS property, the default value is used.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0Hz</code>, or, if <code>0Hz</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + <tr> + <td><code>%</code> {{experimental_inline}}</td> + <td>{{cssxref("<percentage>")}}</td> + <td>The attribute value is parsed as a CSS {{cssxref("<number>")}}, that is without the unit (e.g. <code>12.5</code>), and interpreted as a {{cssxref("<percentage>")}}. If it is not valid, that is not a number or out of the range accepted by the CSS property, the default value is used.<br> + If the given value is used as a length, <code>attr()</code>computes it to an absolute length.<br> + Leading and trailing spaces are stripped.</td> + <td><code>0%</code>, or, if <code>0%</code> is not a valid value for the property, the property's minimum value.</td> + </tr> + </tbody> + </table> + </dd> + <dt><code><fallback></code> {{experimental_inline}}</dt> + <dd>The value to be used if the associated attribute is missing or contains an invalid value. The fallback value must be valid where <code>attr()</code> is used, even if it is not used, and must not contain another <code>attr()</code> expression. If <code>attr()</code> is not the sole component value of a property, its <code><fallback></code> value must be of the type defined by <code><type-or-unit></code>. If not set, CSS will use the default value defined for each <code><type-or-unit></code>.</dd> +</dl> + +<h3 id="Sintaxe_formal">Sintaxe formal</h3> + +{{csssyntax}} + +<h2 id="Exemplos">Exemplos</h2> + +<h3 id="HTML">HTML</h3> + +<pre class="brush: html notranslate"><p data-foo="hello">world</p> +</pre> + +<h3 id="CSS">CSS</h3> + +<pre class="brush: css notranslate">p::before { + content: attr(data-foo) " "; +} +</pre> + +<h3 id="Resultado">Resultado</h3> + +<p>{{EmbedLiveSample("Examples")}}</p> + +<h2 id="Especificações">Especificações</h2> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">Especificação</th> + <th scope="col">Status</th> + <th scope="col">Comentário</th> + </tr> + </thead> + <tbody> + <tr> + <td>{{SpecName('CSS3 Values', '#attr-notation', 'attr()')}}</td> + <td>{{Spec2('CSS3 Values')}}</td> + <td>Added two optional parameters; can be used on all properties; may return other values than {{cssxref("<string>")}}. These changes are experimental and may be dropped during the CR phase if browser support is too small.</td> + </tr> + <tr> + <td>{{SpecName('CSS2.1', 'generate.html#x18', 'attr()')}}</td> + <td>{{Spec2('CSS2.1')}}</td> + <td>Limited to the {{cssxref("content")}} property; always return a {{cssxref("<string>")}}.</td> + </tr> + </tbody> +</table> + +<h2 id="Browser_compatibility">Compatibilidade com navegadores</h2> + +<p>{{Compat("css.types.attr")}}</p> |