What do attributes provide for html elements

Such attributes are called Boolean attributes. Examples of some commonly used Boolean attributes are checked , disabled , readonly , required , etc. Note: Attribute values are generally case-insensitive, except certain attribute values, like the id and class attributes. There are some attributes, such as id , title , class , style , etc. The following section describes their usages. The id attribute is used to give a unique name or identifier to an element within a document. Note: The id of an element must be unique within a single document.

No two elements in the same document can be named with the same id , and each element can have only one id. It may include the datetime attribute to translate dates into machine-readable format, allowing for better search engine results or custom features such as reminders. This is rendered by default as a simple solid underline, but may be altered using CSS. It's typically presented using an italicized version of the current typeface, although that behavior is browser-dependent. HTML supports various multimedia resources such as images, audio, and video.

An image map allows geometric areas on an image to be associated with Hyperlink. It may contain one or more audio sources, represented using the src attribute or the source element: the browser will choose the most suitable one. It can also be the destination for streamed media, using a MediaStream. It lets you specify timed text tracks or time-based data , for example to automatically handle subtitles.

The tracks are formatted in WebVTT format. This content is provided by an external application or other source of interactive content such as a browser plug-in. It is an empty element, meaning that it has no content and does not have a closing tag. It is commonly used to offer the same media content in multiple file formats in order to provide compatibility with a broad range of browsers given their differing support for image file formats and media file formats.

These elements let you provide indications that specific parts of the text have been altered. This can be used when rendering "track changes" or source code diff information, for example. The ins element can be used for the opposite purpose: to indicate text that has been added to the document. You can use the del element to similarly represent a range of text that has been deleted from the document.

The elements here are used to create and handle tabular data. It is generally found within a colgroup element.

It participates in the table model. The exact nature of this group is defined by the scope and headers attributes. The row's cells can then be established using a mix of td data cell and th header cell elements. HTML offers a selection of elements which help to create interactive user interface objects. A summary or label must be provided using the summary element. It represents an unordered list of items represented by li elements , each of these represent a link or other command that the user can activate.

In the above statement we have again used style attribute in paragraph tag, which turns its colour red. Description: The title attribute is used as text tooltip in most of the browsers. It display its text when user move the cursor over a link or any text. You can use it with any text or link to show the description about that link or text. In our example, we are taking this with paragraph tag and heading tag. This attribute gives the link address which is specified in that link.

The href attribute provides the hyperlink, and if it is blank, then it will remain in same page. It is source for the image which is required to display on browser. This attribute can contain image in same directory or another directory. The image name or source should be correct else browser will not display the image. In this chapter you have seen that, we have used attribute with double quotes, but some people might use single quotes in HTML. So use of single quotes with HTML attribute, is also allowed.

The following both statements are absolutely fine. For example, the id attribute uniquely identifies an element whereas the class attribute identifies a whole group of elements.

This labeling information can then be used to target content for styling, scripting, or for the id attribute linking. For more information about these attributes, check out classes vs ids.