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You can run your markup through the validator yourself to find out if what you wrote is valid. But valid markup is not always an indication of valid transport and spaces must be URL encoded (and the hash mark also). You can learn more by searching Stackoverflow. In particular, this SO answer. Your characters are not safe to use.
Why would you do this? Who writes code like that? That's unnecessary space in between "". Literal spaces are not allowed in URLs and they are not part of the data. just formatting for human consumption. You need to remove the whitespace. Some browsers render it as a space. Spaces are valid. And they both are different because, one has spaces, other ...
Not at all. StackExchange does it. Google doesn't care if you link to sister sites, as long as you're not committing link spam.
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