Hi
Thanks.
1. "Error: X-UA-Compatible HTTP header must have the value IE=edge, was IE=Edge,chrome=1."
You can edit /layout/default.php to change that
2. "The center element is obsolete. Use CSS instead." and "The border attribute on the table element is obsolete. Use CSS instead."
This is a custom html in module "As Melhores Marcas de Plataformas Elevatórias", You need to edit it and change to a proper html syntax.
3. "Bad value {handler: 'iframe', size: {x: 560, y: 315}} for attribute rel on element a: The string {handler: is not a registered keyword."
I do not know why this error got in the validation list. Modal codding is a long time plugin, so I cannot understand why it isn't recognised and passed. If W3 has a problem with that than there will be no other way than to replace it with a different popup plugin.