The seal is not important to the user, but it is important for the developer community to advocate for W3C specifications, but it does not guarantee anything.
Some sites use the W3 Consortioum stamps only to promote the new specifications such as HTML5 and CSS3 (the W3 staff itself encourages this. Stamping on shirts, brooches, stickers, etc.), others use improperly to show that they adhere to the new standards of specifications, others, most of which use, really are compliants with the new technology.
With the advent of HTML5, development has become very concerned with accessibility, emphasizing, for example, HTML semantics, turning technologies to the user, so developers can shape better experiences for them.
Seals are not about the speed of traffic on your site or application, but rather on accessibility .
The Internet is the most democratic space you will ever find, however, developers still sin a lot with regard to universal access.
You should not only worry about "running," but also about "running for everyone."
How will a screen reader behave when it comes to reading your site?
It's hard to strictly follow the rules of HTML5 and the new web technologies that come with it, and revolutionize the Web every day using a framework , which is essentially generic in the vast majority of cases.
See the The Paciello Group site on accessibility.
Accessible Culture
Read more about using the stamps on the HTML5 logo home page .
Learn how to use a HTML5 Outliner tool.
You can use as many stamps as you want, but we users will only worry about one that says " secure site ".
The average user is not interested in how websites were made, they rarely connect the technology used for security or speed.
Find more about Philippe Le Hégaret .
I hope I contributed to the discussion.
