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| Attribute Name | Elements | Description |
|---|---|---|
| align | <applet> , <caption> , <col> ,<colgroup> , <hr> , <iframe>, <img> , <table> , <tbody> , <td> , <tfoot> , <th> ,<thead> , <tr> | Specifies the horizontal alignment of the element. |
| alt | Alternative text in case an image can't be displayed. | |
| autoplay | <audio> , <video> | The audio or video should play as soon as possible. |
| bgcolor | <body> , <col> , <colgroup> ,<marquee> , <table> , <tbody>, <tfoot> , <td> , <th> , <tr> |
Background color of the element.
Note: This is a legacy attribute. Please use the CSS
background-color property instead. |
| border | <img> , <object> , <table> |
The border width.
Note: This is a legacy attribute. Please use the CSS
border property instead. |
| checked | <command> , <input> | Indicates whether the element should be checked on page load. |
| cite | <blockquote> , <del> , <ins> ,<q> | Contains a URI which points to the source of the quote or change. |
| class | Global attribute | Often used with CSS to style elements with common properties. |
| code | <applet> | Specifies the URL of the applet's class file to be loaded and executed. |
| color | <basefont> , <font> , <hr> |
This attribute sets the text color using either a named color or a color specified in the hexadecimal #RRGGBB format.
Note: This is a legacy attribute. Please use the CSS
color property instead. |
| cols | <textarea> | Defines the number of columns in a textarea. |
| colspan | <td> , <th> | The colspan attribute defines the number of columns a cell should span. |
| content | <meta> | A value associated with http-equiv or namedepending on the context. |
| dir | Global attribute | Defines the text direction. Allowed values are ltr (Left-To-Right) or rtl (Right-To-Left) |
| dirname | <input> , <textarea> | |
| disabled | <button> , <command> ,<fieldset> , <input> ,<keygen> , <optgroup> ,<option> , <select> ,<textarea> | Indicates whether the user can interact with the element. |
| form | <button> , <fieldset> ,<input> , <keygen> , <label> ,<meter> , <object> , <output>, <progress> , <select> ,<textarea> | Indicates the form that is the owner of the element. |
| headers | <td> , <th> | IDs of the <th> elements which applies to this element. |
| height | <canvas> , <embed> , <iframe>, <img> , <input> , <object> ,<video> | Note: In some instances, such as <div> , this is a legacy attribute, in which case the CSS height property should be used instead. In other cases, such as <canvas> , the height must be specified with this attribute. |
| href | <a> , <area> , <base> , <link> | The URL of a linked resource. |
| hreflang | <a> , <area> , <link> | Specifies the language of the linked resource. |
| list | <input> | Identifies a list of pre-defined options to suggest to the user. |
| loop | <audio> , <bgsound> ,<marquee> , <video> | Indicates whether the media should start playing from the start when it's finished. |
| low | <meter> | Indicates the upper bound of the lower range. |
| manifest | <html> | Specifies the URL of the document's cache manifest. |
| max | <input> , <meter> ,<progress> | Indicates the maximum value allowed. |
| maxlength | <input> , <textarea> | Defines the maximum number of characters allowed in the element. |
| media | <a> , <area> , <link> ,<source> , <style> | Specifies a hint of the media for which the linked resource was designed. |
| method | <form> | Defines which HTTP method to use when submitting the form. Can be GET (default) or POST. |
| min | <input> , <meter> | Indicates the minimum value allowed. |
| multiple | <input> , <select> | Indicates whether multiple values can be entered in an input of the type email or file. |
| name | <button> , <form> ,<fieldset> , <iframe> ,<input> , <keygen> , <object>, <output> , <select> ,<textarea> , <map> , <meta> ,<param> | Name of the element. For example used by the server to identify the fields in form submits. |
| placeholder | <input> , <textarea> | Provides a hint to the user of what can be entered in the field. |
| poster | <video> | A URL indicating a poster frame to show until the user plays or seeks. |
| rel | <a> , <area> , <link> | Specifies the relationship of the target object to the link object. |
| required | <input> , <select> ,<textarea> | Indicates whether this element is required to fill out or not. |
| reversed | <ol> | Indicates whether the list should be displayed in a descending order instead of a ascending. |
| rows | <textarea> | Defines the number of rows in a textarea. |
| rowspan | <td> , <th> | Defines the number of rows a table cell should span over. |
| selected | <option> | Defines a value which will be selected on page load. |
| size | <input> , <select> | Defines the width of the element (in pixels). If the element's type attribute is text orpassword then it's the number of characters. |
| span | <col> , <colgroup> | |
| src | <audio> , <embed> , <iframe> ,<img> , <input> , <script> ,<source> , <track> , <video> | The URL of the embeddable content. |
| style | Global attribute | Defines CSS styles which will override styles previously set. |
| tabindex | Global attribute | Overrides the browser's default tab order and follows the one specified instead. |
| title | Global attribute | Text to be displayed in a tooltip when hovering over the element. |
| type | <button> , <input> ,<command> , <embed> ,<object> , <script> ,<source> , <style> , <menu> | Defines the type of the element. |
| value | <button> , <option> , <input>, <li> , <meter> , <progress> ,<param> | Defines a default value which will be displayed in the element on page load. |
| width | <canvas> , <embed> , <iframe>, <img> , <input> , <object> ,<video> | Note: In some instances, such as <div> , this is a legacy attribute, in which case the CSS width property should be used instead. In other cases, such as <canvas> , the width must be specified with this attribute. |
*thanks to Mozilla Developer Network for the attribute list
