I am using an iPad (4th gen) with iOS 8.4. I would like to have it support spell checking. By spell checking I mean that misspelled words should be underlined in red (or otherwise distinctlively marked) when they appear in editable text fields.

My General>>Keyboard settings are shown here

The reason is that when I type I make plentitudenous spelling mistakes.

For example. I am entering this question into a <textarea> element on a web page. After I type the "word" plentitudenous, it should be indicated that it it misspelled. And it should remain so indicated after I have changed it to plenitudenous. Only after I change it to plenitudinous, should the marking go away.

Similarly, if I runtwo words together while composing an email in the Mail app, it should be so indicated.

I have a iOS 8.4 (12H143) Ipad model A1458. I sometimes use a logitech bluetooth keyboard.