Code That looks the same on the front and back end
Responsive Design
UX Design
User Experience
Everything about usability and UI beyond just asthetics
Color Model
Color Model
A Numeric Representation of Color
RGB
RGBA
CMYK
HSL
HSLA
HSB
HBA
Gradient
Gradient
Color/Opacity Variation
Filter
Filter
"Special Effects" for images
Greyscale
Blur
Color Maps
SVG
Scalable Vector Graphics
Images that aren't pixable based
They SCALE
Kerning
Kerning
In typography or mortising is the process of adjusting the spacing between characters in a proportional font, usually to achieve a visually pleasing result.