Native composition comes first
Korean, Japanese, Chinese, and Hindi input may pass through several unfinished states before a character is committed. Typing Ink lets the browser and operating system own that composition instead of trying to rebuild it.
Unfinished composition is shown as current input but is not scored as a mistake.
If the keyboard language is wrong
Input from an incompatible script is not inserted into the passage. A brief message asks you to switch keyboards, and the passage position stays where it was.
Latin punctuation, digits, and shared symbols are still accepted when the passage calls for them.
Backspace and mistakes
A wrong committed character is marked and you may continue. Extra text at a word boundary stays beside the current word after you type the expected space; Space never erases it. Only Backspace removes that input, following the active browser IME, including Korean jamo composition before a whole syllable disappears.
Pasting is blocked during scored practice so a result continues to represent keyboard input. In Your text, pasted source material remains private in memory for that practice.