http://validator.w3.org/check?uri=http://www.oldschooldos.com Is this bad for SEO purposes? I don't know how these errors were made, and even looking at them, there doesn't seem to be anything wrong with them, stuff is just red for no reason it seems.
That's really bad code. I doubt it will be parsed correctly to be of use past the second document declaration. There is one Doc declaration, well look. <DOCTYPE> <html> <head> </head> <body> </body> </html> You have to clean up that code quite a bit.
Ya, DW doesnt do that at all. It appears to be a copy and paste. Also you have opening tags then closing tags with no content. You only need <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> once at the top of the site.
I php include three things per page. Should I go into these included files and delete the <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> from them?
I guess my real question is, should I learn how and fix this? Would it help my site get spidered better? I looked around, and even Google has a ton of violations. Should I bother with this?
I can't live without it. I lose sleep and get up in the middle of the night to fix it, At least on most pages. It's up to you, a few errors is one thing, but three doc declarations can't be good nor 3 headers. I prefer it to validate myself.