::placeholderThe ::placeholder CSS pseudo-element selects help text in <input> and <textarea> elements when no value is set.selectorsSelectorswidely2020-01-152022-07-15https://drafts.csswg.org/css-pseudo-4/#placeholder-pseudocss-placeholderhttps://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/::placeholdercss.selectors.placeholderhttps://nowyoucanuse.com/features--placeholder.html