Password masking

[muan]

whatwg/html#7293
whatwg/compat#240
https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-text-security

[IK-Ngoo]

可參考資料：

• Show/Hide password accessibility and password hints tutorial
• https://codepen.io/vavroom/embed/MWbzjYv/dd415130df80f26049567f8050470f19?default-tab=html
• https://adrianroselli.com/2017/01/avoid-messages-under-fields.html
• https://adrianroselli.com/2019/02/avoid-default-field-validation.html