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Alt TextA few tips on how and when to use the alt attribute:
- Use the alt attribute for any image that is used as content.
- Use an empty alt atribute for any image that is decorative or not necessary for understanding the content of the page (alt=”“).
- Make sure the description of the image is useful. For example, if the image is your logo your alt should be your company name and not “logo”
The alt attribute is meant to help users using assitive techonology not miss any content, so make sure your text is helpful to anyone not seeing the image.
The title global attribute contains a text representing advisory information related to the element it belongs to. Such information can typically, but not necessarily, be presented to the user as a tooltip. Here are some typical uses of this attribute:
- Link: the title or a description of the linked document
- Media element like an image: a description or associated credits
- Paragraph: a footnote or a commentary about it
- Quotation: some information about the author, and so on.
If this attribute is omitted, it means that the title of the nearest ancestor of this element is still relevant for it (and can legitimately be used as the tooltip for that element. If this attribute is set to the empty string, it explicitly means that its nearest ancestor's title is not relevant for this element (and shouldn't be used in the tooltip for that element).
Additional semantics are attached to the title attributes of the <link>, <abbr>, <input> and <menuitem> elements.
banner - typically the "header" of the page
navigation - any navigation list, typically the nav element
main - the main content area
complimentary - information that is tangentially related to the main content
contentinfo - contains information about the parent document such as copyrights and privacy statements
Section 508 of the U.S. Code is the law that requires federal agencies and their contractors to adhere to a minimal level of accessibility. The law can be loosely interpreted and basically boils down to:
the use of text labels or descriptors for graphics and certain format elements. (HTML code already provides an "Alt Text" tag for graphics which can serve as a verbal descriptor for graphics). This section also addresses the usability of multimedia presentations, image maps, style sheets, scripting languages, applets and plug-ins, and electronic forms.
<.visually-hidden> - The Visually-Hidden class allows for 508 Compliance on an element needed for visually assisted users.