Reported environment
OS: Android 10-14
Device: Mobile (Pixel, Motorola, etc.) Any
Browser: Firefox for Android 120+
Keyboard: Korean (IME) - Gboard
Sample HTML: Plain paragraph (CJK + ASCII) Inline link boundary (CJK) Nested inline wrappers (bold/italic/span) Paragraph + list mix (CJK) Whitespace & special chars (ZWNBSP, NBSP) Invisible characters (ZWNBSP, NBSP, LF, CR, TAB) Rich inline + nested + list (previous default) Blog post (headings + images + text) Table with inline content (CJK) Blockquote + code block + lists Complex nested structure (divs + spans) Mixed media (images + videos + text) Plain paragraph (Japanese IME) Plain paragraph (Chinese IME) Plain paragraph (Thai IME) Plain paragraph (Vietnamese IME) Plain paragraph (Arabic IME, RTL) Plain paragraph (Hindi IME, Devanagari) Non-editable elements (contenteditable=false) HTML entities (<, >, &, etc.) Link editing (nested links, boundaries) Table editing (cells, boundaries) Code block editing (pre, code) Empty elements (empty p, div) RTL + LTR mixed (Arabic + English) Emoji + text mixed Long text + line wrapping