<resolution> - CSS: Cascading Style Sheets
the <resolution> data type consists of a strictly positive <number> followed by one of the units listed below. as with all css dimensions, there is no space between the unit literal and the number. units dpi represents the number of dots per inch. screens typically contains 72 or 96 dots per inch, but the dpi for printed documents is usually much greater. as 1 inch is 2.54 cm, 1dpi ≈ 0.39dpcm. dpcm represents the number of dots per centimeter. as 1 inch is 2.54 cm, 1dpcm ≈ 2.54dpi. dppx represents the number of dots per px unit. due to the 1:96 fixed ratio of css in to css px, 1dppx is equivalent to 96dpi, which corresponds to the default resolution of images displayed in css as defined by image-resolution. x alias for dppx. note: although the number 0 is always the same re...
...resents the number of dots per px unit. due to the 1:96 fixed ratio of css in to css px, 1dppx is equivalent to 96dpi, which corresponds to the default resolution of images displayed in css as defined by image-resolution. x alias for dppx. note: although the number 0 is always the same regardless of unit, the unit may not be omitted. in other words, 0 is invalid and does not represent 0dpi, 0dpcm, or 0dppx. examples use in a media query @media print and (min-resolution: 300dpi) { ... } valid resolutions 96dpi 50.82dpcm 3dppx invalid resolutions 72 dpi spaces are not allowed between the number and the unit. ten dpi the number must use digits only. 0 the unit is required. specifications specification status comment css values and units...

Web audio codec guide - Web media technologies
itu), the g.722 codec is designed specifically for voice compression. its audio coding bandwidth is limited to the 50 hz to 7,000 hz range, which covers most of the frequency range of typical human vocalization. this makes it ill-suited for handling any audio that might range outside the human speech range, such as music. g.722 audio is encoded using adaptive differential pulse code modulation (adpcm), in which each sample is represented not by its absolute value, but as a value indicating how much the new sample differs from the previous sample. g.722 is primarily used with webrtc connections, as it's one of the audio codecs mandated by the webrtc specification. supported bit rates g.722: 48 kbps, 56 kbps, and 64 kbps; however, in practice 64 kbps is always used g.722 annex...
...64 kbps; however, in practice 64 kbps is always used g.722 annex b super wide-band: 64 kbps, 80 kbps, and 96 kbps g.722 annex d stereo wide-band: 64 kbps and 80 kbps g.722 annex d stereo super wide-band: 80 kbps, 96 kbps, 112 kbps, and 128 kbps variable bit rate (vbr) support no supported sample formats 14-bit integer supported sample rates 16 khz (adpcm is specified to allow 8 khz, 11.025 khz, 22.05 khz, 44.1 khz, but g.722 uses 16 khz) recommended minimum bit rate for stereo sound 128 kbps at 44.1 khz sample rate compression lossy maximum audio channels 2 audio frequency bandwidth 50 hz - 7 khz latency 4 ms browser compatibility feature chro...

Media container formats (file types) - Web media technologies
it is derived from the resource interchange file format (riff), and as such is similar to other formats such as apple's aiff. ...
... audio/wave1 audio/wav audio/x-wav audio/x-pn-wav [1] the audio/wave mime type is the standard type, and is preferred; however, the others have been used by various products over the years and may be used as well in some environments. audio codecs supported by wave codec browser support chrome edge firefox safari adpcm (adaptive differential pulse code modulation) no gsm 06.10 no lpcm (linear pulse code modulation) yes mpeg-1 audio layer iii (mp3) no µ-law (u-law) no webm webm (web media) is a format based on matroska which is designed specifically for use in modern web environments. it's base...

CSS numeric factory functions - Web APIs
(number); css.vi(number); css.vb(number); css.vmin(number); css.vmax(number); css.cm(number); css.mm(number); css.q(number); css.in(number); css.pt(number); css.pc(number); css.px(number); // <angle> css.deg(number); css.grad(number); css.rad(number); css.turn(number); // <time> css.s(number); css.ms(number); // <frequency> css.hz(number); css.khz(number); // <resolution> css.dpi(number); css.dpcm(number); css.dppx(number); // <flex> css.fr(number); examples we use the css.vmax() numeric factory function to create a cssunitvalue: let height = css.vmax(50); console.log( height ); // cssunitvalue {value: 50, unit: "vmax"} console.log( height.value ) // 50 console.log( height.unit ) // vmax in this example, we set the margin on our element using the css.px() factory function: ...

CSS values and units - CSS: Cascading Style Sheets
written as 1hz or 1hz, is one cycle per second. resolution unit resolution units are represented by the type <resolution>. they represent the size of a single dot in a graphical representation, such as a screen, by indicating how many of these dots fit in a css inch, centimeter, or pixel. it accepts the following values: unit description dpi dots per inch. dpcm dots per centimetre. dppx, x dots per px unit. percentages a <percentage> is a type that represents a fraction of some other value. percentage values are always relative to another quantity, for example a length. each property that allows percentages also defines the quantity to which the percentage refers. this quantity can be a value of another property of the same eleme...

CSS reference - CSS: Cascading Style Sheets
ule-colorcolumn-rule-stylecolumn-rule-widthcolumn-spancolumn-widthcolumnsconic-gradient()containcontentcontrast()<counter>counter-incrementcounter-resetcounter-set@counter-stylecounters()cross-fade()cubic-bezier()::cue::cue-regioncursor<custom-ident>d:defaultdeg<dimension>:dirdirection:disableddisplay<display-box><display-inside><display-internal><display-legacy><display-listitem><display-outside>dpcmdpidppxdrop-shadow()eelement()ellipse()em:emptyempty-cells:enabledenv()exffallback (@counter-style)filter<filter-function>:first:first-child::first-letter (:first-letter)::first-line (:first-line):first-of-typefit-content()<flex>flexflex-basisflex-directionflex-flowflex-growflex-shrinkflex-wrapfloat:focusfont@font-facefont-familyfont-family (@font-face)font-feature-settingsfont-feature-settings (@...

image-set() - CSS: Cascading Style Sheets
option># ) where <image-set-option> = [ <image> | <string> ] <resolution> and <string> is an <url> values most commonly you'll see an url() <string> value, but the <image> can be any image type except for an image set. the image-set() function can not be nested inside another image-set() function. <resolution> units include x or dppx, for dots per pixel unit, dpi, for dots per inch, and dpcm for dots per centimeter. every image within an image-set() must have a unique resolution. examples background-image: image-set( "cat.png" 1x, "cat-2x.png" 2x, "cat-print.png" 600dpi); this example shows how to use image-set() to provide two alternative background-image options, chosen depending on the resolution needed: a normal version...