If you are planning to use standard media queries, read the next section carefully. firstChild instanceof HTMLSourceElement) video. Mat Marquis demonstrated this by showing how the browser approaches it with math. Press "Select new video" button.Browse to the location of the folder you'd like to add and select video. Update: After being inspired by the suggestions of Florian Rivoal (editor of the CSS Media Queries spec) and Markus Ernst over on the whatwg mailinglist Respondu now supports a new hybrid format that combines picture and srcset in a way that reduces markup and increases flexibility for the best of both worlds. It's important, though, to make sure you understand the technique. If nothing happens, download Xcode and try again. Browsers can then use this information to pick the best image source. Ingored if, Currently, the library supports only width based responsiveness, The library doesn't support multiple sources. insertBefore (video. If nothing happens, download GitHub Desktop and try again. The code is available under the MIT License. Video Source Set. In the present day of widescreen monitors, internet TVs, multiple sized tablets and smart phones our designs now have to cater for everything from 320px wide up to potentially as high as 7680px wide.Along with this multi-resolution landscape comes a need for images to stretch or shrink to fit these wildly varying requirements. Browser Support Add or remove as many breakpoints as you like. History of