Twenty Eleven Child Theme Not Working in Internet Explorer

• Try disabling plugins to find whether any are largely responsible for your invalid markup.
• Start at the top of the list in the W3C validator.
• Refer to W3C’s error definition guidelines https://validator.w3.org/docs/errors.html

For instance my first error is this:

Line 189, Column 238: Attribute pubdate not allowed on element time at this point.
…me=”2012-12-06T22:45:37+00:00″ pubdate>December 6, 2012</time><span class=…

It says Line 189, Column 238. Where is that?

Which page were you validating?

The whole site. I put the domain in the validator

https://www.totalmuaythai.com

& 242 errors, & five warnings came up.

That’s just the home page.

Here’s where your ‘For instance’ error is, https://snag.gy/krfTU.jpg .
It’s just underneath your post titles, it’s in the code but is invisible on the website.

So it’s probably within the template used for that page.

How do I get in there, and correct that?

Sorry, I’m not sure how to do that within a Child Theme.