[css-masking-1] Change initial value for mask-repeat to repeat and ma…

…sk-position to 0% 0%. #111

css-masking-1/Overview.bs

@@ -530,7 +530,7 @@ See the section <a href="#layering">“Layering multiple mask layer images”</a
 <pre class=propdef>
 Name: mask-repeat
 Value: <<repeat-style>>#
-Initial: no-repeat
+Initial: repeat
 Applies to: All elements. In SVG, it applies to <a>container elements</a> excluding the <a element>defs</a> element, all <a>graphics elements</a> and the <a element>use</a> element
 Inherited: no
 Percentages: n/a
@@ -569,7 +569,7 @@ See the section <a href="#layering">“Layering multiple mask layer images”</a
 <pre class=propdef>
 Name: mask-position
 Value: <<position>>#
-Initial: center
+Initial: 0% 0%
 Applies to: All elements. In SVG, it applies to <a>container elements</a> excluding the <a element>defs</a> element, all <a>graphics elements</a> and the <a element>use</a> element
 Inherited: no
 Percentages: refer to size of <a>mask painting area</a> <em>minus</em> size of <a>mask layer image</a>; see text 'background-position' [[!CSS3BG]]