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Copy file name to clipboardExpand all lines: entries/attr.xml
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<p>According to the <ahref="https://www.w3.org/TR/html401/interact/forms.html#h-17.4">W3C forms specification</a>, the <code>checked</code> attribute is a <em><ahref="http://www.w3.org/TR/html4/intro/sgmltut.html#h-3.3.4.2">boolean attribute</a></em>, which means the corresponding property is <strong>true</strong> if the attribute is present at all—even if, for example, the attribute has no value or is set to empty string value or even "false". This is true of all boolean attributes.</p>
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<p>According to the <ahref="https://www.w3.org/TR/html401/interact/forms.html#h-17.4">W3C forms specification</a>, the <code>checked</code> attribute is a <em><ahref="https://www.w3.org/TR/html4/intro/sgmltut.html#h-3.3.4.2">boolean attribute</a></em>, which means the corresponding property is <strong>true</strong> if the attribute is present at all—even if, for example, the attribute has no value or is set to empty string value or even "false". This is true of all boolean attributes.</p>
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<p>Nevertheless, the most important concept to remember about the <code>checked</code> attribute is that it does not correspond to the <code>checked</code> property. The attribute actually corresponds to the <code>defaultChecked</code> property and should be used only to set the <em>initial</em> value of the checkbox. The <code>checked</code> attribute value does not change with the state of the checkbox, while the <code>checked</code> property does. Therefore, the cross-browser-compatible way to determine if a checkbox is checked is to use the property:</p>
<p>In jQuery 1.4.3 setting an element's data object with <code>.data(obj)</code> extends the data previously stored with that element.</p>
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<p>Prior to jQuery 1.4.3 (starting in jQuery 1.4) the <code>.data()</code> method completely replaced all data, instead of just extending the data object. If you are using third-party plugins it may not be advisable to completely replace the element's data object, since plugins may have also set data.</p>
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<p><strong>jQuery 3</strong> changes the behavior of this method to align it to the <ahref="https://www.w3.org/TR/html5/dom.html#dom-dataset">Dataset API specifications</a>. Specifically, jQuery 3 transforms every two-character sequence of "-" (U+002D) followed by a lowercase ASCII letter by the uppercase version of the letter as per definition of <ahref="http://www.w3.org/TR/html5/dom.html#dom-dataset">the algorithm of the Dataset API</a>. Writing a statement like <code>$( "body" ).data( { "my-name": "aValue" } ).data();</code> will return <code>{ myName: "aValue" }</code>.</p>
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<p><strong>jQuery 3</strong> changes the behavior of this method to align it to the <ahref="https://www.w3.org/TR/html5/dom.html#dom-dataset">Dataset API specifications</a>. Specifically, jQuery 3 transforms every two-character sequence of "-" (U+002D) followed by a lowercase ASCII letter by the uppercase version of the letter as per definition of <ahref="https://www.w3.org/TR/html5/dom.html#dom-dataset">the algorithm of the Dataset API</a>. Writing a statement like <code>$( "body" ).data( { "my-name": "aValue" } ).data();</code> will return <code>{ myName: "aValue" }</code>.</p>
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<p>Due to the way browsers interact with plugins and external code, the <code>.data()</code> method cannot be used on <code><object></code> (unless it's a Flash plugin), <code><applet></code> or <code><embed></code> elements.</p>
<p><strong>jQuery 3</strong> changes the behavior of this method to align it to the <ahref="https://www.w3.org/TR/html5/dom.html#dom-dataset">Dataset API specifications</a>. Specifically, jQuery 3 transforms every two-character sequence of "-" (U+002D) followed by a lowercase ASCII letter by the uppercase version of the letter as per definition of <ahref="http://www.w3.org/TR/html5/dom.html#dom-dataset">the algorithm of the Dataset API</a>. Writing a statement like <code>$( "body" ).data( { "my-name": "aValue" } ).data();</code> will return <code>{ myName: "aValue" }</code>.</p>
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<p><strong>jQuery 3</strong> changes the behavior of this method to align it to the <ahref="https://www.w3.org/TR/html5/dom.html#dom-dataset">Dataset API specifications</a>. Specifically, jQuery 3 transforms every two-character sequence of "-" (U+002D) followed by a lowercase ASCII letter by the uppercase version of the letter as per definition of <ahref="https://www.w3.org/TR/html5/dom.html#dom-dataset">the algorithm of the Dataset API</a>. Writing a statement like <code>$( "body" ).data( { "my-name": "aValue" } ).data();</code> will return <code>{ myName: "aValue" }</code>.</p>
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<ahref="#data-html5">HTML5 data-* Attributes</a>
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<p>As of jQuery 1.4.3 <ahref="https://johnresig.com/blog/html-5-data-attributes/">HTML 5 data- attributes</a> will be automatically pulled in to jQuery's data object. The treatment of attributes with embedded dashes was changed in jQuery 1.6 to conform to the <ahref="http://www.w3.org/TR/html5/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes">W3C HTML5 specification</a>.</p>
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<p>As of jQuery 1.4.3 <ahref="https://johnresig.com/blog/html-5-data-attributes/">HTML 5 data- attributes</a> will be automatically pulled in to jQuery's data object. The treatment of attributes with embedded dashes was changed in jQuery 1.6 to conform to the <ahref="https://www.w3.org/TR/html5/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes">W3C HTML5 specification</a>.</p>
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