H
- Half-leading
- In CSS,
half-leading is the leading split in half and applied
equally to the top and bottom edges of the element's
content-area. The difference between font-size and
line-height, applied equally above and below the
content-area for each element.
- HCI
- HCI stands for "Human Computer Interaction." It is the
study of how people relate to electronic tools and
interfaces.
- Head
Pointer
- A device attached to the user's head, that allows a
user to move the pointer on the screen, (usually moved by
the mouse, a pointing device, the arrow keys, or with the
movement of their head). It is useful for people who have
limited mobility.
- Headings
- In (X)HTML there are 6 levels of headings, h1 through to h6. To maintain
the logical structure of your documents, headings
should follow a logical progression. Headings of
level 3 shouldn't follow directly from headings
of level 1, only from headings of level 2. You should
always try to maintain a distinction between appearance
and logic. Simply because an element is a heading
of level 2 does not mean that it will be rendered
larger and bolder than regular text in the document.
Style sheets allow a web designer to very easily
apply any styling to a heading. Keep in mind too,
that there are browsers which don't display information
in a visual way, relying on text to speech conversion,
or braille conversion. For maximum accessibility,
structural elements such as headings should be used
correctly, and appropriately.
- Hearing Disability
- The condition of a person who experiences partial or
total loss of hearing.
- Heuristic (Expert) Evaluation
- Heuristic evaluation is where a group of usability experts scrutinize
a website and evaluate each element of the site
against a list of commonly accepted principles or
rules of thumb. They apply their training and experience
to conduct independent evaluations. Research shows
that such evaluations can identify a majority of
the usability problems, with the problem-identification
percentage increasing as evaluators are added. The
major drawback of heuristic evaluation is that evaluators,
regardless of their skill and experience, remain
surrogate users (expert evaluators who emulate users)
and not necessarily typical users of the product.
- Hexadecimal
- Hexadecimal numbers are used in HTML and CSS, and other
computing applications, to represent colors. The bytes
represent the red, green and blue components of the color.
One byte represents a number in the range 00 to FF (in
hexadecimal notation), or 0 to 255 in decimal notation. The
hex triplet is formed by concatenating three bytes in
hexadecimal notation. The system uses numbers from 0 to 9
and letters from a to f in any combination of six (and
starting with an octothorpe) to represent the correlating
red, green, and blue colors (#RRGGBB). e.g. #FFFFFF = 255,
255, 255 = white.
- Hierarchy
- Hierarchy is a top down organizational structure.
- Horizontal Scrolling
- Horizontal scrolling is scrolling sideways within a web
browser's window. When a site has content that is wider
than the browser window, users must scroll horizontally to
see it. Horizontal scrolling should be avoided if possible.
It's awkward to do and users hate it.
- Hue
- Hue is the name of a distinct color of the spectrum
(e.g. red, green, yellow, orange, blue). It is the
particular wavelength frequency.
- HyperText Markup
Language (HTML)
- The markup language that is used on most of the World
Wide Web to create web pages. The standards for HTML are
controlled by the W3C.
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