Get ::placeholder color using Javascript
Solution 1:
the second parameter of getComputedStyle is pseudoElt selector
so to get placeholder color of your input element:
var styles = window.getComputedStyle(inputEl, ':placeholder');
console.log(styles.getPropertyValue('color'));
Solution 2:
It's
window.getComputedStyle(inputEl, '::placeholder').getPropertyValue("color");
// note the DOUBLE colon here ----^^
Works in both Chrome and Firefox