/* 只限制演示文案的常规选取，不影响用户填写和编辑表单。 */
body, body * {
  -webkit-user-select: none;
  user-select: none;
}
input:not([readonly]):not(:disabled),
textarea:not([readonly]):not(:disabled),
[contenteditable="true"], [contenteditable="true"] *,
[contenteditable="plaintext-only"], [contenteditable="plaintext-only"] * {
  -webkit-user-select: text;
  user-select: text;
}