Update clip.js to use parseLength instead of parseLengthPercentage

Tests in WPT format are included in jsdom/jsdom#3999.

Author: asamuzaK

lib/properties/clip.js

@@ -1,6 +1,6 @@
 "use strict";
 // deprecated
-// @see https://drafts.fxtf.org/css-masking/#clip-property
+// @see https://drafts.csswg.org/css-masking-1/#clip-property
 
 const parsers = require("../parsers");
 
@@ -25,7 +25,7 @@ module.exports.parse = function parse(v, opt = {}) {
         const parsedValues = [];
         for (const item of values) {
           const parsedValue = parsers.parseCSS(item, { context: "value" }, true);
-          const val = parsers.parseLengthPercentage(parsedValue.children);
+          const val = parsers.parseLength(parsedValue.children);
           if (val) {
             parsedValues.push(val);
           } else {