I'm trying to find an official documentation of the features introduced in each Javascript (ecma) version. The best I could find so far is this: compat table es2016plus and w3schools

And maybe this one: ecma262 In the introduction section is a brief overview over the introduced features of the ecma versions. But I'm missing padStart and padEnd for the String.

But is there really no official document that lists the features introduced in which version?