Riddle me this:
I am home to the letters,
But I am not the alphabet.
Whenever there be errors,
The display may then correct / A corner may correct.
You can find my ancestor,
Only in the highest row.
Ten units is its measure,
Being not numeric, though.
What am I?
I have included the slash, as in some cases, corrections do not happen automatically.
Both my ancestor and I are compounds,
Such that I keep to a name (same start).
Either of us hold this riddle spellbound,
Though no enthral nor enchantments take part.
Apologies for my sloppy rhyming, and if this riddle is too easy; I am currently running out of ideas of answers that have not been famously riddled about. It is likely that I will get back to doing anagram puzzles (or Riley riddles!) for the time being. Also, not much knowledge is needed for this riddle.
The answer to the riddle and the answer's ancestor is hidden in the title (as well as another minor clue). To get you started, I must point out that writers like Poky himself hate wordy sentences.
Whoever finds the full answer and ancestor in the title will receive a 50 rep bounty reward. (Turns out, the user who solved the entire puzzle altogether, namely @Bass, kindly refused the bounty reward offer.)