The result was that unescaped ampersands in attribute values could cause Netscape to use the wrong attribute value.In today’s web, various and very different spiders can crawl your website.

The result on some invalid pages varied from an incomplete or incoherent title to unreadable text.

Netscape 2.0 provided the most stark display of the importance of validation.

Now, I do not have a lot of experience with Pinterest, so I can’t say how they handle errors.

To make sure all your data is rendered correctly, you should use the following tools.

In this case, considered to be under your control as well.

The alternative validation via HTTP or CNAME may take up to 1 hour.

If you are activating a COMODO Multi-domain certificate for subdomains, you should place the validation file into the Document root directory of the corresponding subdomain and for its domain as well.

In order to proceed with HTTP validation of Wildcard certificates, it is necessary to place the verification file to the root folder of a main domain (for instance, you have a certificate for *, the file should be placed to the root folder of If you have activated the certificate with as FQDN in your CSR code, please make sure that the file is available via

Some spiders are very sensitive to errors, like Twitter.