Metadata Markup

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Jeremy Keith looks at the competing standards for the metadata that goes in the head which ultimately helps services such as Slack, Twitter and Facebook to create a preview of the content of a website. Unfortunately the lack of consensus is an annoying problem for developers:

We’ve seen this kind of waste before. I remember when Netscape and Microsoft were battling it out in the browser wars: Internet Explorer added a proprietary acronym element, while Netscape added the abbr element. They both basically did the same thing. For years, Internet Explorer refused to implement the abbr element out of sheer spite.