HTML Attributes



      Attributes provide additional information about HTML elements.
    HTML Attributes

    All HTML elements can have attributes
    Attributes provide additional information about an element
    Attributes are always specified in the start tag
    Attributes usually come in name/value pairs like: name="value" The lang Attribute
    The language of the document can be declared in the tag.
    The language is declared with the lang attribute.
    Declaring a language is important for accessibility applications (screen readers) and search engines:



    The first two letters specify the language (en). If there is a dialect, use two more letters (US).
    The title Attribute

    Here, a title attribute is added to the

    element. The value of the title attribute will be displayed
    as a tooltip when you mouse over the paragraph:
    Example

    That is the name of my school.

    The href Attribute
    HTML links are defined with the tag. The link address is specified in the href attribute:
    Example
    This is a link
    You will learn more about links and the tag later in this tutorial.

    Size Attributes

    azuBecshops.htm HTML images are defined with the tag.

    The filename of the source (src), and the size of the image (width and height)
    are all provided as attributes:

    Example


    The image size is specified in pixels: width="204" means 104 screen pixels wide.
    You will learn more about images and the tag later in this course.

    The alt Attribute
    The alt attribute specifies an alternative text to be used, when an image cannot be displayed.
    The value of the attribute can be read by screen readers. This way, someone "listening"
    to the webpage, e.g. a blind person, can "hear" the element.
    Example




    Use Lowercase Attributes
    The HTML5 standard does not require lowercase attribute names.
    The title attribute can be written with uppercase or lowercase like title or TITLE.
    W3C recommends lowercase in HTML, and demands lowercase for stricter document types like XHTML.
    At W3Schools we always use lowercase attribute names.
    Quote Attribute Values
    The HTML5 standard does not require quotes around attribute values.
    The href attribute, demonstrated above, can be written as:
    Example


    Using quotes are the most common. Omitting quotes can produce errors.
    At azubec we always use quotes around attribute values.

    Single or Double Quotes?
    Double quotes around attribute values are the most common in HTML,
    but single quotes can also be used.
    In some situations, when the attribute value itself contains double quotes,
    it is necessary to use single quotes:


    Or vice merry:


    Chapter Summary
    All HTML elements can have attributes
    The title attribute provides additional "tool-tip" information
    The href attribute provides address information for links
    The width and height attributes provide size information for images
    The alt attribute provides text for screen readers
    At W3Schools we always use lowercase attribute names
    At W3Schools we always quote attribute values with double quotes

    HTML Attributes
    Below is an alphabetical list of some attributes often used in HTML:
    Attribute Description
    alt Specifies an alternative text for an image, when the image cannot be displayed
    disabled Specifies that an input element should be disabled
    href Specifies the URL (web address) for a link
    id Specifies a unique id for an element
    src Specifies the URL (web address) for an image
    style Specifies an inline CSS style for an element
    title Specifies extra information about an element (displayed as a tool tip)