Update javadoc for getCssValue()
@@ -306,9 +306,12 @@ default String getAccessibleName() {
/**
* Get the value of a given CSS property.
- * Color values should be returned as rgba strings, so,
- * for example if the "background-color" property is set as "green" in the
- * HTML source, the returned value will be "rgba(0, 255, 0, 1)".
+ * Color values could be returned as rgba or rgb strings.
+ * This depends on whether the browser omits the implicit opacity value or not.
+ *
+ * For example if the "background-color" property is set as "green" in the
+ * HTML source, the returned value could be "rgba(0, 255, 0, 1)" if implicit opacity value is
+ * preserved or "rgb(0, 255, 0)" if it is omitted.
*
* Note that shorthand CSS properties (e.g. background, font, border, border-top, margin,
* margin-top, padding, padding-top, list-style, outline, pause, cue) are not returned,
