swa66 - 8:25 am on Jan 23, 2009 (gmt 0)

Every page I touch with an editor gets validated afterward, and fixed till it validates.

I mostly use the w3.org validators as they are easy to use from the web developer toolbar add-on for firefox.

The WDG HTML Validator above link is interesting. I tried it on a few smaller sites and they went through with flying colors. I tried it also on one of my old sites and well, I fixed quite a few errors. Now if they didn't have that 100 page limit (think that site has many thousands), I'd get them all.
Where did these errors come from on that site (a site I do care a lot about, it's my first):

• old age: Over the years content got updated to look ok, but I didn't always use that it will validate attitude (and since it's setup with heavy use of SSI, the content itself isn't often edited at all.)
  I didn't fix certain pages that are intended to be replaced real soon now (that's 15 year old content right there, and html version 1 was ... a bit different)
  
• generated content: some generated content was way out of wack, not sure where it came from but it stood out that generated stuff deteriorates faster than static content for some reason
  
• somewhat dynamic content that got unexpected input over time (e.g. something pulling links in that had "&" to separate parameters instead of "&", easy code fix, but the problem wasn't there when first implemented.)