Meta name="subject" should be same or can be different ?

I wanted to know if I can add same meta name="subject" for all pages of the website or I can add different subjects for the pages according to their content. :confused:

meta name="identifier-URL" and meta property="og:url" should be the domain link on all the pages or it should be the specific url of that html page?

I had always associated the 'og' meta tags with Yoast SEO plugin for WP but it turns out that the history is more interesting. The 'open graph' specification was developed by FaceBook to allow control of how a website is displayed within FB. https://blog.kissmetrics.com/open-graph-meta-tags/

As far as the "subject" line it should relate to the page keyword and be different for pages dealing with different subject matter.

I think it should be different for different pages.

No I think it should be different.

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Originally Posted by WebHostWala

I wanted to know if I can add same meta name="subject" for all pages of the website or I can add different subjects for the pages according to their content. :confused:

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You should be used the different meta Titles, Description for the each web page if you will use the same for each page so it will affect your rankings and it also confuses the SE crawlers for the same.