Why WordPress strips scr string from img tag off?

Because the correct attribute is src. S.R.C, not S.C.R. (I’d have assumed it was a typo in the question, but you used it 3 times).

The WordPress editor removes attributes that aren’t whitelisted, and since scr isn’t an actual attribute it’s not on the whitelist.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)