f2e5e26af3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
964 B
964 B
prefix
Returns the prefixed version (if necessary) of a CSS property that the browser supports.
Use Array.prototype.findIndex() on an array of vendor prefix strings to test if document.body has one of them defined in its CSSStyleDeclaration object, otherwise return null.
Use String.prototype.charAt() and String.prototype.toUpperCase() to capitalize the property, which will be appended to the vendor prefix string.
const prefix = prop => {
const capitalizedProp = prop.charAt(0).toUpperCase() + prop.slice(1);
const prefixes = ['', 'webkit', 'moz', 'ms', 'o'];
const i = prefixes.findIndex(
prefix => typeof document.body.style[prefix ? prefix + capitalizedProp : prop] !== 'undefined'
);
return i !== -1 ? (i === 0 ? prop : prefixes[i] + capitalizedProp) : null;
};
prefix('appearance'); // 'appearance' on a supported browser, otherwise 'webkitAppearance', 'mozAppearance', 'msAppearance' or 'oAppearance'