Examples of CSS properties practical usage URI, user-select, etc.

URI
URL
u1100
ubUserFeedIcon
ubUserURL
ui-accordion-header
ui-btn
ui-button
ui-datepicker-next
ui-datepicker-prev
ui-helper-clearfix
ui-icon
ui-link
ui-slider-handle
ui-state-active
ui-state-default
ui-tabs-active
ui-tabs-nav
uiOptimize
uid
uk-active
uk-animation-hover
uk-article
uk-block
uk-button
uk-button-danger
uk-button-link
uk-button-primary
uk-button-success
uk-clearfix
uk-close
uk-close-alt
uk-comment-header
uk-container
uk-dotnav
uk-dropdown
uk-dropdown-width-2
uk-dropdown-width-3
uk-dropdown-width-4
uk-dropdown-width-5
uk-form-blank
uk-form-row
uk-grid
uk-grid-divider
uk-icon-adjust
uk-icon-adn
uk-icon-align-left
uk-icon-align-right
uk-icon-ambulance
uk-icon-anchor
uk-icon-android
uk-icon-angle-left
uk-icon-angle-right
uk-icon-angle-up
uk-icon-apple
uk-icon-archive
uk-icon-arrow-right
uk-icon-arrow-up
uk-icon-asterisk
uk-icon-backward
uk-icon-barcode
uk-icon-beer
uk-icon-bell
uk-icon-bitbucket
uk-icon-bitcoin
uk-icon-bold
uk-icon-bolt
uk-icon-book
uk-icon-briefcase
uk-icon-btc
uk-icon-bug
uk-icon-bullhorn
uk-icon-bullseye
uk-icon-button
uk-icon-calendar
uk-icon-camera
uk-icon-caret-down
uk-icon-caret-left
uk-icon-caret-right
uk-icon-caret-up
uk-icon-certificate
uk-icon-check
uk-icon-chevron-up
uk-icon-circle
uk-icon-cloud
uk-icon-cny
uk-icon-code
uk-icon-code-fork
uk-icon-coffee
uk-icon-cogs
uk-icon-columns
uk-icon-comments
uk-icon-compass
uk-icon-copy
uk-icon-credit-card
uk-icon-crop
uk-icon-css3
uk-icon-cut
uk-icon-dashboard
uk-icon-desktop
uk-icon-download
uk-icon-dribbble
uk-icon-dropbox
uk-icon-edit
uk-icon-eject
uk-icon-envelope
uk-icon-eraser
uk-icon-eur
uk-icon-euro
uk-icon-exchange
uk-icon-exclamation
uk-icon-expand
uk-icon-facebook
uk-icon-fighter-jet
uk-icon-file
uk-icon-file-text
uk-icon-film
uk-icon-filter
uk-icon-fire
uk-icon-flag
uk-icon-flickr
uk-icon-folder-open
uk-icon-font
uk-icon-forward
uk-icon-foursquare
uk-icon-gbp
uk-icon-gift
uk-icon-github
uk-icon-gittip
uk-icon-glass
uk-icon-globe
uk-icon-google-plus
uk-icon-group
uk-icon-headphones
uk-icon-heart
uk-icon-home
uk-icon-hover
uk-icon-html5
uk-icon-inbox
uk-icon-info
uk-icon-inr
uk-icon-instagram
uk-icon-italic
uk-icon-key
uk-icon-krw
uk-icon-laptop
uk-icon-leaf
uk-icon-legal
uk-icon-level-down
uk-icon-link
uk-icon-linkedin
uk-icon-linux
uk-icon-list
uk-icon-list-alt
uk-icon-list-ol
uk-icon-list-ul
uk-icon-lock
uk-icon-magic
uk-icon-magnet
uk-icon-mail-reply
uk-icon-male
uk-icon-map-marker
uk-icon-medkit
uk-icon-microphone
uk-icon-minus
uk-icon-money
uk-icon-paperclip
uk-icon-paste
uk-icon-pause
uk-icon-pencil
uk-icon-phone
uk-icon-pinterest
uk-icon-play
uk-icon-play-circle
uk-icon-plus
uk-icon-power-off
uk-icon-print
uk-icon-qrcode
uk-icon-question
uk-icon-quote-left
uk-icon-quote-right
uk-icon-random
uk-icon-refresh
uk-icon-renren
uk-icon-repeat
uk-icon-reply
uk-icon-reply-all
uk-icon-retweet
uk-icon-road
uk-icon-rocket
uk-icon-rotate-left
uk-icon-rss
uk-icon-rupee
uk-icon-save
uk-icon-search
uk-icon-share
uk-icon-shield
uk-icon-sitemap
uk-icon-skype
uk-icon-sort
uk-icon-sort-down
uk-icon-sort-up
uk-icon-spinner
uk-icon-star
uk-icon-star-half
uk-icon-stethoscope
uk-icon-stop
uk-icon-subscript
uk-icon-superscript
uk-icon-table
uk-icon-tablet
uk-icon-tag
uk-icon-tags
uk-icon-tasks
uk-icon-terminal
uk-icon-text-height
uk-icon-text-width
uk-icon-th
uk-icon-th-large
uk-icon-th-list
uk-icon-thumbs-down
uk-icon-thumbs-up
uk-icon-ticket
uk-icon-tint
uk-icon-trello
uk-icon-trophy
uk-icon-truck
uk-icon-tumblr
uk-icon-twitter
uk-icon-umbrella
uk-icon-underline
uk-icon-undo
uk-icon-unlock
uk-icon-unlock-alt
uk-icon-upload
uk-icon-usd
uk-icon-user
uk-icon-user-md
uk-icon-vk
uk-icon-volume-down
uk-icon-volume-off
uk-icon-volume-up
uk-icon-weibo
uk-icon-windows
uk-icon-wrench
uk-icon-xing
uk-icon-yen
uk-icon-youtube
uk-link
uk-link-muted
uk-link-reset
uk-nav-header
uk-navbar
uk-navbar-brand
uk-navbar-content
uk-navbar-toggle
uk-open
uk-overlay
uk-overlay-area
uk-overlay-hover
uk-overlay-panel
uk-overlay-toggle
uk-pagination
uk-panel
uk-panel-divider
uk-panel-title
uk-search
uk-search-field
uk-slidenav
uk-slider
uk-subnav
uk-tab
uk-tab-bottom
uk-tab-center
uk-tab-grid
uk-thumbnail
uk-thumbnav
uk-tooltip-bottom
uk-tooltip-top
uk-tooltip-top-left
uk-vertical-align
uk-visible-hover
ul-w-button1
ul-w-mainmenu-item
um-anchoremulator
unavailable
underline
uneditable-input
unicode-bidi
unicode-range
update
updated
uploader
url
urlKeyword
use_from
used
user
user-select
username
usersite-container