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http://libpng.org/pub/png/pngapbr.html
Likewise, PNG's alpha-channel support (including "RGBA palette" mode) and support for automatic gamma correction are particularly useful on the Web--at least where fully and correctly supported by browsers. This page lists standard 2D browsers; see the appropriate pages for listings of VRML browsers and other 3D applications.
https://www.lambdatest.com/png-alpha-transparency
PNG alpha transparency. Semi-transparent areas in PNG files. There are two unique methodologies utilized by realistic record groups for supporting straightforward picture territories: basic twofold straightforwardness and alpha straightforwardness.
https://en.wikipedia.org/wiki/Portable_Network_Graphics
Portable Network Graphics ... PNG became the optimal choice for small gradient images as web browser support for the format improved. No images at all are needed to display gradients in modern browsers, as gradients can be ... 6.0 and below have broken alpha-channel transparency support (will display the default background color instead). ...Developed by: PNG Development Group …
https://stackoverflow.com/questions/5825716/png-24-and-browser-support
Browser support is good enough that you can use PNG-24. IE6 even supports PNG-24. If you're using the images for sliders, though, you'll probably want transparency and PNG-32 is supported by every modern browser as well.
http://www.w3.org/Graphics/PNG/inline-alpha.html
Test inline PNG images Alpha channel support. PNG images can contain alpha (transparency) information. Unlike GIF, which requires a particular color to be designated fully transparent, PNG allows the transparency of all pixels to take any value from fully transparent though partial transparency to full opacity.
http://www.howtocreate.co.uk/alpha.html
PNG also supports binary transparency, as well as full Alpha, meaning that each pixel of the image can also have one of 256 different levels of transparency (or 65 thousand levels if you really want to). PNG format produces files with approximately the same file size as the equivalent GIF image, assuming they have the same number of colours.
https://css-tricks.com/css-transparency-settings-for-all-broswers/
I’d love to see some live examples of these styles in action. I was thinking it might be neat to have a floating div with the random letters of half a secret message, with the other half of the letters in a background image or something so you’d have to scroll down to exactly the right point in order to reveal the full message.
https://meta.wikimedia.org/wiki/Fixing_transparent_PNGs
A "decent" percentage of Internet users might use Internet Explorer for Windows as their primary web browser. Among other problems, this browser doesn't properly support PNG images with alpha channel transparency. This has given rise to the myth that IE doesn't support transparent PNGs. IE does support transparency in indexed-color PNG images in which a color is …
http://entropymine.com/jason/testbed/pngtrans/
Uses dithering to simulate alpha transparency. This is a good thing for the browser to do if it does not support true alpha transparency. Uses web page background color, and fully transparent pixels are transparent. This is another acceptable thing to do if the browser cannot support true alpha transparency.
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