A Web page or HTML document is considered valid when
it complies with World Wide Web Consortium recommendations.
Validation is the process of verifying that markup,
cascading style sheets, etc. comply with World Wide Web
Consortium recommendations. You can use the
Validator to verify that your pages meet the standards.
It is important to use structural markup according to
published formal grammars. For more information consult
CSS a value is a
length, quality, type or URL
assigned to a style property for an element. CSS properties
each have specific ranges of value or token types, which may
be declared for them.
In programming, variables represent data. Like all
programming languages, PHP allows you to store bits of data
in variables, and then to access that data by writing the
variable's name. A variable is probably most simply explained
as an area of memory set aside to store information, and it
is assigned a particular identifier by the programmer. In
PHP all variable names must start with the dollar sign
character "$". There is no limit on the length of a variable.
Variable names in PHP are case-sensitive.
Veranda is a humanist sans serif font designed by master
typographer Matthew Carter. Microsoft commissioned Carter to
create two faces specifically for web use, and the results
were Veranda and Georgia (a serif face), probably they are
good general-purpose faces available for low-resolution
displays of the web. Verdana's, regular spacing makes it more
readable on screen. Cartier has said that "Wider spacing
wasn't enough, it also had to be more regular, this was thing
that gave it an advantage in readability. Verdana really
isn't wide, the sensation of width comes from the
vertical-align is a CSS
property that affects the vertical positioning inside a
line box of the boxes generated by an inline-level element.
It applies only to inline elements, although that includes
replaced elements such as images and form inputs. It is not
inherited. Element content is typically vertically centered
on a rendered line (with extra line-height amounts distributed
equally on the top and bottom.) This property allows inline
content boxes to be vertically aligned with respect to several
different criteria on a rendered line.
A visual disability is a condition of a person who experiences
partial or total loss of vision.
Voice Input software recognizes voice commands, and responds
A Mac and iOS screenreader and accessibility tool.
Voice output computer programs read the screen to a user.
Voice Recognition Software
Voice recognition programs recognize a person's voice
and its various characteristics. This term is closely related
to voice input. It is software that can be trained to recognize
a person's voice, and either execute commands, or turn the voice
into text or other forms of media such as sign language for the
A type of XML that allows the user to interact with a web
page using voice recognition software.
Voluntary Product Accessibility Template (VPAT)
A voluntary product accessibility template is a tool to
document a product's conformance with the accessibility standards
under U.S. Section 508 of the
Rehabilitation Act. It can assist buyers in making preliminary