Update for 2023
The team at TopTal has revised and updated the web checklist – Here is the updated link
https://www.toptal.com/developers/webdevchecklist
Great Improvement:

this is a great tool to prepare for a website or application launch.
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I was reading some of my news feeds and came across this great site called http://webdevchecklist.com/.
It is a creation of Sayed Ibrahim Hashimi and Mads Kristensen. I often publish a site and run through a few tests. Some I do religiously, but others I often forget. The list they put together lets you pick and select what area to work in.
For example here is a shot of the useable area. I have checked it off the list and expanded that area. It’s showing me tools or sites to validate usability. I went back and looked a recent deployment of mine and ran through the checklist. This is a great tool to use or share with others. From simple things like SEO and robots.txt this list can cover some base questions.