How come inline video src media queries aren't working?

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I have two videos for a webpage I created recently but the inline media queries aren't working.

The player is just pulling the first video in the list of sources.

Here is my code:

        <video class="intro-video" controls poster="lineandgrid-video-intro-cover.gif">
            <source media="(max-width: 750px)" src="lineandgrid-introduction-video-mobile.mp4" type="video/mp4">
            <source media="(min-width: 751px)" src="lineandgrid-introduction-video.mp4" type="video/mp4">
        </video>

Can someone tell me what I'm doing wrong? You can view the live webpage here: https://lineandgrid.ca/video/

video css html
1 Answers

Media queries are generally only supported for <picture> elements.

Attributes: Media: Media query of the resource's intended media; this should be used only in a <picture> element.

Source: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/source:

Chrome does not support inline media queries on the source tag within videotag. [...] Worse, plain media queries will not stop multiple videos from loading, which effectively doubles your data, so it requires a JS solution.

Source: https://blog.greggant.com/posts/2019/08/02/responsive-videos-javascript-solution-video-source-tag.html

The proposed JS solution, if the original blog post becomes unavailable: https://gist.githubusercontent.com/fuzzywalrus/8abdd088e3fb6a73fd5d980f7bab0118/raw/9922cce9c4c040164f383671070e588c2adff944/responsivevideo.js

Original answer:

Apparently, support for inline media queries has been removed:

Chrome not respecting video source inline media queries

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