mm, in ratio use width/height, ie. 1024/768, 16/9 color, monochrome use number, ie. 1, 2, 3... etc. resolution use dpi, dpcm orientation only portrait and landscape are valid value scan only progressive and interlace are valid value grid only 0 and 1 are vaild value
@viewport rule. Mobile devices has lots of resolution. 㫮㫭㫠㫜㫮㫧㫦㫩㫫㫔㫲 㫔㫔㫔㫔㫮㫠㫛㫫㫟㫨㫔㫢㫞㫞㫧㫯㫩 㫴 㫮㫤㫜㫛㫠㫘㫔㫦㫥㫣㫰㫔㫪㫚㫩㫜㫜㫥㫔㫘㫥㫛㫔㫖㫤㫘㫯㫛㫮㫠㫛㫫㫟㫨㫔㫢㫦㫞㫧㫯㫗㫔㫲㫔㫜㫜㫜㫔㫴 㫮㫤㫜㫛㫠㫘㫔㫖㫔㫛㫮㫜㫙㫢㫠㫫㫛㫤㫠㫥㫛㫛㫜㫭㫠㫚㫜㫛㫧㫠㫯㫜㫣㫛㫩㫘㫫㫠㫦㫨㫔㫠㫔㫗㫔㫲 㫔㫔㫔㫔㫝㫘㫔㫠㫗㫟㫦㫥㫜㫢㫔㫘㫝 㫴
(ie. iPhone4), screen resolution is 640x960 that specification say so. So, can we use @media ( max-width: 640px ) to do our job? NO. You should use @media ( max-width: 320px ) cause the device-pixel-ratio is 2.
that was 100px by 100px, you'd provide an image that was 200px by 200px, but specify in CSS or as an attribute in HTML that it is 100px by 100px. The reason this works is that a pixel on the screen is not the same as a CSS pixel. This is a good thing, because otherwise as I say, things would be tiny. --Rich Bradshaw ” Pixel density, retina display and font-size in CSS
elements to fit the layout. 㫭㫘㫩㫔㫧㫩㫦㫤㫠㫪㫜㫔㫫㫔㫛㫦㫚㫬㫤㫜㫥㫫㫜㫙㫦㫛㫰㫜㫦㫝㫝㫪㫜㫫㫘㫠㫛㫫㫟㫔㫳㫳㫔㫛㫦㫚㫬㫤㫜㫥㫫㫜㫛㫦㫚㫬㫤㫜㫥㫫㫘㫣㫜㫤㫜㫥㫫㫜㫦㫝㫝㫪㫜㫫㫘㫠㫛㫫㫟㫔 㫳㫳㫔㫮㫠㫥㫛㫦㫮㫜㫠㫥㫥㫜㫩㫘㫠㫛㫫㫟㫩 㫠㫝㫔㫖㫔㫧㫩㫦㫤㫠㫪㫜㫔㫫㫫㫔㫤㫡㫡㫔㫗㫔㫲 㫔㫔㫔㫔㫝㫘㫔㫗㫦㫔㫰㫦㫬㫩㫔㫪㫧㫜㫚㫠㫘㫣㫔㫨㫬㫜㫩㫰㫔㫟㫜㫩㫜㫜㫔㫘㫝 㫴㫔㫜㫣㫪㫜㫔㫲 㫔㫔㫔㫔㫝㫘㫔㫙㫠㫞㫟㫫㫔㫮㫠㫫㫟㫔㫰㫦㫬㫩㫔㫗㫗㫚㫔㫘㫥㫛㫔㫗㫘㫘㫗㫔㫯㫘㫗㫗㫘㫜㫔㫘㫝 㫴
failed. Retrofit existing design is too difficult. Original design is NOT content first. Visual design cannot reuse in the narrow styles. Alomst overwriting all the style we have. Vary hard to fine tune in the mobile device. We do REALLY not want to test Android devices.
which the device really have and IT IS READ-ONLY. In the other word, it called "visual viewport". actual viewport After initial viewport, this is the rules you setting in the viewport, in the other word, it called "layout viewport".
creating a dedicated mobile site; the choice is between using media queries and doing nothing at all. That said, in many situations the content you want to serve up will be the same regardless of context. --Jeremy Keith ” A responsive mind
look at media queries MEDIA QUERIES PRESENTATION AT INDIECONF ESSENTIAL CONSIDERATIONS FOR CRAFTING QUALITY MEDIA QUERIES Rethinking the Mobile Web Responsive Web Design A dao of Web Design More about device-pixel-ratio A tale of two viewports - part two CSS Device Adaptation CSS3 Media Queries Resolution Units Viewport percentage lengthes List of displays by pixel density