Apologies and problems
It turned out that the opera WMFvideo next door was a suspiciously hyped feature that the other browser camp had had for years; Looks like Vivaldi is always making smart decisions! In addition, last night a page suddenly opened white screen suspected to be internal viewer or Widevine plugin problem. Vb-62222 will also follow up and join OpenXR in the next release with core 80.0.
In fact, in the last few instances of the H5Player plugin technology questionnaire, another opera is not as compatible as the Vivaldi browser.