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https://stackoverflow.com/questions/29416579/how-to-feature-detect-if-browser-supports-webm-alpha-transparency
My plan is to display the video poster image instead of the video, if the browser does not support alpha transparency. So the video should only play, if the browser supports WebM alpha transparency. I know how to detect the browser or the rendering engine and therefore play the video (see code below) - but is there a "feature detection" way?
https://www.lambdatest.com/png-alpha-transparency
BROWSER SUPPORT FOR PNG alpha transparency. Google Chrome. PNG alpha transparency is compatible for Chrome browser version 4 to 67. Mozilla Firefox. This browser property is compatible for Mozilla Firefox browser. Internet Explorer. Internet Explorer browser version 6 doesn't support this browser element. Later Safari browser version from 7 to ...
https://css-tricks.com/rgba-browser-support/
May 19, 2010 · RGBa is a way to declare a color in CSS that includes alpha transparency support. It looks like this: ... CSS-Tricks own Sarah Drasner is a heck of a designer, ... Only dissapointment is the lack of widespread browser support. kesc. Permalink to comment # February 4, 2009.
https://electrictoolbox.com/opacity-internet-explorer-css3-pie-alpha-transparency/
Alpha transparency is a much easier way to make a background transparent than having to specify a whole bunch of cross browser CSS opacity statements and works in a wide variety of browsers, with the usual exception of Internet Explorer prior to version 9. If you are using the CSS3 PIE utility in your web project then there’s an easy way to use alpha transparency with CSS3 PIE.
https://en.wikipedia.org/wiki/Portable_Network_Graphics
6.0 and below have broken alpha-channel transparency support (will display the default background color instead). 7.0 and below cannot combine 8-bit alpha transparency AND element opacity (CSS – filter: Alpha (opacity=xx)) without filling partially transparent sections with black. 8.0 and below have inconsistent/broken gamma support.Developed by: PNG Development Group (donated to W3C)
https://css-tricks.com/css-transparency-settings-for-all-broswers/
CSS Transparency Settings for All Browsers . Author Chris Coyier . 78 Comments . Go to Comments ... hover to the img element not the anchor element. IE doesn’t support pseudo classes on img elements I don’t think. ... I was thinking that couldn’t be realized transparency in all browser, but now this script has changed my mind. Thanx. David.
https://www.tutorialrepublic.com/css-tutorial/css-opacity.php
CSS Opacity. The opacity CSS property specifies the transparency of an element. Cross Browser Opacity. Opacity is now a part of the CSS3 specifications, but it was present for a long time. However, older browsers have different ways of controlling the opacity or transparency. CSS Opacity in Firefox, Safari, Chrome, Opera and IE9
https://developers.google.com/web/updates/2013/07/Alpha-transparency-in-Chrome-video
Aug 14, 2019 · Chrome 31 now supports video alpha transparency in WebM. In other words, Chrome takes the alpha channel into account when playing 'green screen' videos encoded to WebM (VP8 and VP9) with an alpha channel. This means you can play videos with transparent backgrounds: over web pages, images or even other videos.
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