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We are unable to add alt tags to the banner images as they live inside CSS. We can add a title tag on the div title for the banner. Does that help with SEO and accessibility?

If we want to eliminate one of our domains and consolidate it with our main domain by the subdomain approach, would that negatively impact our SEO? Example: change www.xyz.org to www.xyz.abcd.org, Thanks, in advance, for your feedback.

Page A has a canonical to Page B. Should Page A have meta data values such as description, keywords, dublin core values, etc.? If yes, should the meta data values be different on Page A and Page B?

For example, we have 3 different subsites with the same pages. We will put canonicals so they reference the main pages. Do the meta descriptions have to be different for each of the three pages? How does Google handle meta data when using canonicals?

Does Google have specific criteria to show a large card in the top right of SERPs that links to a national organization's Wikipedia-referenced info? These do not appear to be the Google Business Card created by individual organizations. Example having the card and org is on wikipedia: https://www.google.com/?ion=1&espv=2#q=u.s. department of labor Example no card shown and org is on wikipedia: https://www.google.com/?ion=1&espv=2#q=Occupational+Information+network