This term encompasses any of a number of devices and
device types. It is basically any device or technology that
uses electronic means to transmit and present information to
the user. Examples include Computers, mobile phones,
information kiosks, televisions, and many other devices.
Element
In
HTML,
an element is of node in the document tree. A
HTML
element is represented by a start tag like
<h1> and an
end tag like </h1>.
Em Box
The box around a font character of a given 'size' as
designed by the designer. It is sometimes referred to as an
em-square. The theoretical square that glyphs are designed
upon. Its height is the intended distance between lines of
type in the same type size. It is the design grid on which
the glyph outlines are defined.
Em Unit
In
CSS
an 'em' is what is referred to as a relative unit, like
percentages. Good design allows scaling and uses relative
size values; it almost always provides excellent
implementation of ems. An 'em' is equal to the computed value
of the 'font-size' property of the element on which it is
based. The exception is when an 'em' occurs in the value of
the 'font-size' property itself, in which case it refers to
the font size of the parent element. It may be used for
vertical or horizontal measurement.
Embedded Style Sheet
An embedded style controls the appearance of a single
document. CSS rule(s) are placed in the head of the document
via the style element. Embedded styles can be really helpful
when you are first learning to code CSS, because it is very
easy to edit and troubleshoot the code. Similar to inline
styles, embedded CSS defeats the purpose of separating
content and presentation. An embedded style sheet can be
useful when a single document has a unique style. If the same
style sheet is used in multiple documents, then an external
style sheet would be more appropriate. Embedded styles are
sometimes referred to as internal styles.
Equivalent
Content is "equivalent" to other content when both
fulfill essentially the same function or purpose upon
presentation to the user. In the context of the document,
the equivalent must fulfill essentially the same function for
the person with a disability (at least insofar as is
feasible, given the nature of the disability and the state of
technology), as the primary content does for the person
without a disability.
An external type of style sheet is a separate file apart
from the HTML file(s). The external style sheet is given a
.css extension. It is associated to the HTML document using a
link element or an @import directive in the head of the html
document. Any html document associated to an external style
sheet gets the styles, and that is where the maintenance
power of CSS is found. Not only do external style sheets
allow reuse of rules within one specific document. They allow
the style sheet itself to be shared across multiple
documents. Using external CSS allows you to maintain a single
style sheet for an entire site.
Eyetracking
An eyetracking device observes a person's pupil to
determine the direction of their gaze. It can aid in learning
the relative intensity of a user's attention to various parts
of a web page. For more information consult
Eyetracking.
