HTML5 was the fifth and last major version of HTML that is a World Wide Web Consortium (W3C) recommendation. https://en.wikipedia.org/wiki/HTML5
- Why is it "HTML5 was" instead of "HTML5 is"?
- What is the difference in semantics if it's "is"?
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Because it might not be the last, ever. There might be an HTML6 in the future (in fact, a quick Google says there will be). In this context, "last" means "latest" rather than "final".
Saying it was the last allows for the possibility that something else could come along and replace it. Saying it is the last means it is definitively, positively the last there will ever be.
You could even say it "was the last" after it is succeeded, when the meaning shifts to "the previous", for example:
HTML6 is the latest version of HTML. HTML5 was the last version.
As an alternative you could say that HTML is the latest, the most recent or the current version.