CSS Master

Property Description Acceptable values

Presence and accuracy of the none | coarse | fine

primary pointing device as

determined by the user agent

pointer

Presence and accuracy of any none | coarse | fine

pointing device available to the

user

any-pointer

Which scanning process is used interlace | progressive

by the output display

scan

none | initial-only |

enabled

Whether scripting languages are

supported for the current

document

scripting

Whether the content can be none | slow | normal

modified after output (think

paper versus screens)

update-frequency

Onediscretefeaturequerythatwecanusenowishover(alongwithany-hover).

Asyoumayhaveguessedbythename,thehovermediafeaturequeryallowsusto

setdifferentstylesbasedonwhethertheprimaryinputmechanismsupportsthe

:hoverstate.Theany-hoverfeatureworksmuchthesameway,butappliestoany

inputmechanism,notjusttheprimaryone.Sincethisisadiscretefeaturetype,this

propertyhasjustthreepossiblevalues:

■ none:devicehasnohoverstate

■ on-demand:devicesometimeshasahoverstate;forexample,afteralongpress

(mostbrowsersanddevices)

■ hover:devicehasahoverstate

Considerthecaseofradiobuttonsandcheckboxformcontrolsontouchscreens.

Touchscreenstypicallyhaveanon-demandhoverstate,butmaylackonecom-

pletely.Adult-sizedfingersarealsofatterthanthepointersofmostmouseor

trackpadinputs.Forthosedevices,wemightwanttoaddmorepaddingaroundthe

label,makingiteasiertotap:

286 CSS Master