Add width, height, x, y as support by symbol

W3C ISSUE - w3c/svgwg#803
look at https://developer.mozilla.org/en-US/docs/Web/SVG/Element/symbol

Author: anthony-redFox

build.js

@@ -128,6 +128,9 @@ while (++index < rows2.length) {
   }
 }
 
+// GITHUB ISSUE - Missing attributes in SVGSymbolElement https://github.com/w3c/svgwg/issues/803
+map2.symbol.add('x').add('y').add('width').add('height')
+
 maps.push(map2)
 
 /** @type {Set<string>} */

index.js

@@ -3704,6 +3704,7 @@ export const svgElementAttributes = {
     'font-weight',
     'glyph-orientation-horizontal',
     'glyph-orientation-vertical',
+    'height',
     'image-rendering',
     'kerning',
     'letter-spacing',
@@ -3735,8 +3736,11 @@ export const svgElementAttributes = {
     'unicode-bidi',
     'viewBox',
     'visibility',
+    'width',
     'word-spacing',
-    'writing-mode'
+    'writing-mode',
+    'x',
+    'y'
   ],
   tbreak: [
     'requiredExtensions',