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Looks like ECMA's site is overloaded. Here's a Wayback Machine link for the lazy: https://web.archive.org/web/20170711055957/https://www.ecma-...

If you're using Chrome, you can also go to cache://www.ecma-international.org/publications/standards/Ecma-262.htm (replacing https:// with cache://)

That's just doing a google search, so you could do "cache:{URL}" in firefox's search field too