Properly discover video resources

Fixes #5496, #5847, #5268

Author: dragonstyle

news/changelog-1.4.md

@@ -57,6 +57,10 @@
 - ([#5625](https://github.com/quarto-dev/quarto-cli/issues/5625)): Prefer the website image (if specified) over undecorated images that appear in the page.
 - ([#5932](https://github.com/quarto-dev/quarto-cli/issues/5932)): Correct Open Graph metadata key name for `og:site_name`
 
+## Video (and Audio)
+
+- ([#5496](https://github.com/quarto-dev/quarto-cli/issues/5496), [#5847](https://github.com/quarto-dev/quarto-cli/issues/5847), [#5268](https://github.com/quarto-dev/quarto-cli/issues/5268)): Properly display local audio and video files with website projects (properly discover the `src` as a resource)
+
 ## Preview
 
 - Display render output/progress for previews that take longer than 2 seconds

src/core/html.ts

@@ -94,6 +94,7 @@ export const kHtmlResourceTags: Record<string, string[]> = {
   "embed": ["src"],
   "iframe": ["src"],
   "section": ["data-background-image", "data-background-video"],
+  "source": ["src"],
 };
 
 export function discoverResourceRefs(