| Attribute | Belongs to | Description |
|---|---|---|
| align | Not supported in HTML 5. | Specifies the alignment according to surrounding elements. Use CSS instead |
| title | Global Attributes | Specifies extra information about an element |
| style | Global Attributes | Specifies an inline CSS style for an element |
| id | Global Attributes | Specifies a unique id for an element |
| dir | Global Attributes | Specifies the text direction for the content in an element |
| lang | Global Attributes | Specifies the language of the element's content |
| alt | <area>, <img>, <input> | Specifies an alternate text when the original element fails to display |
| bgcolor | Not supported in HTML 5. | Specifies the background color of an element. Use CSS instead |
| border | Not supported in HTML 5. | Specifies the width of the border of an element. Use CSS instead |
| class | Global Attributes | Specifies one or more classnames for an element (refers to a class in a style sheet) |
| color | Not supported in HTML 5. | Specifies the text color of an element. Use CSS instead |
| cols | <textarea> | Specifies the visible width of a text area |
| colspan | <td>, <th> | Specifies the number of columns a table cell should span |
| content | <meta> | Gives the value associated with the http-equiv or name attribute |
| datetime | <del>, <ins>, <time> | Specifies the date and time |
| form | <button>, <fieldset>, <input>, <keygen>, <label>, <meter>, <object>, <output>, <select>, <textarea> | Specifies the name of the form the element belongs to |
| href | <a>, <area>, <base>, <link> | Specifies the URL of the page the link goes to |
| label | <track>, <option>, <optgroup> | Specifies the title of the text track |
| list | <input> | Refers to a <datalist> element that contains pre-defined options for an <input> element |
| onchange | All visible elements. | Script to be run when the value of the element is changed |
| onclick | All visible elements. | Script to be run when the element is being clicked |
| placeholder | <input>, <textarea> | Specifies a short hint that describes the expected value of the element |
| required | <input>, <select>, <textarea> | Specifies that the element must be filled out before submitting the form |
| span | <col>, <colgroup> | Specifies the number of columns to span |
| src | <audio>, <embed>, <iframe>, <img>, <input>, <script>, <source>, <track>, <video> | Specifies the URL of the media file |
| width | <canvas>, <embed>, <iframe>, <img>, <input>, <object>, <video> | Specifies the width of the element |
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