This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The placeholder property of the HTMLInputElement interface represents a hint to the user of what can be entered in the control. It reflects the <input> element's placeholder attribute.
A string.
const inputElement = document.getElementById("phone");
console.log(input.placeholder);
| Specification |
|---|
| HTML> # dom-input-placeholder> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
placeholder |
3 | 12 | 4 | ≤12.1 | 4 | 18 | 4 | ≤12.1 | 3.2 | 1.0 | 4.4 | 3.2 |
<input>HTMLInputElement.value::placeholder pseudo-element:placeholder-shown pseudo-class
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/placeholder