W3C validation - Bad value for attribute srcset on element source

Thank you.

One obvious solution was already provided under No JavaScript > Lazy load. You will not have this issue.

However since it is optional, your solution should be in only after enough considerations:
I worried about the most efficient kind of placeholder to put in in these massive SRCSET tags given also massive placeholders like large enough data URI. Not to mentioned when combined with BLUR effect.

That would defeat some performance goal when every byte counts.

Perhaps a simple fixed blank SVG placeholder will do, separated from regular ones?

Picture got no love since #2752865: Support PICTURE element for the responsive image → . If you got one, that would be a great contribution.

Let me know?

This should be more efficient than regular placeholders, and make everyone happier ever after.

Also fixed for local video.

For immediate solutions, including other related issues, comment #4 is the only solid solution.

In modern era with client-side driven websites, some tools like this validator, CSSLint, etc. are getting a bit outdated due to hardly being updated. Very useful to spot obvious stupidity like this issue, though. But don't count on it for some outdated stuffs.

For outdated issues, my comments still stand:
#3277360: W3c validation issue →

Feel free to re-open if any further improvements.

Thank you for contribution.

Automatically closed - issue fixed for 2 weeks with no activity.