Function isValidEscape

src/test/resources/libraries/html2canvas/html2canvas.js:924–929

(c1, c2)

            codePoint === DELETE);
    };
    var isValidEscape = function (c1, c2) {
        if (c1 !== REVERSE_SOLIDUS) {
            return false;
        }
        return c2 !== LINE_FEED;
    };
    var isIdentifierStart = function (c1, c2, c3) {
        if (c1 === HYPHEN_MINUS) {
            return isNameStartCodePoint(c2) || isValidEscape(c2, c3);