CSS: add limit to trim whitespace only for custom prop

fecore1 · fecore1 · commit b6a958e91519 · 2021-09-14T10:16:03.000+08:00
diff --git a/src/css.js b/src/css.js
@@ -4,6 +4,7 @@ import nodeName from "./core/nodeName.js";
 import rcssNum from "./var/rcssNum.js";
 import isIE from "./var/isIE.js";
 import rnumnonpx from "./css/var/rnumnonpx.js";
+import rcustomProp from "./css/var/rcustomProp.js";
 import cssExpand from "./css/var/cssExpand.js";
 import isAutoPx from "./css/isAutoPx.js";
 import cssCamelCase from "./css/cssCamelCase.js";
@@ -24,7 +25,6 @@ var
 	// except "table", "table-cell", or "table-caption"
 	// See here for display values: https://developer.mozilla.org/en-US/docs/CSS/display
 	rdisplayswap = /^(none|table(?!-c[ea]).+)/,
-	rcustomProp = /^--/,
 	cssShow = { position: "absolute", visibility: "hidden", display: "block" },
 	cssNormalTransform = {
 		letterSpacing: "0",
diff --git a/src/css/curCSS.js b/src/css/curCSS.js
@@ -1,18 +1,22 @@
 import jQuery from "../core.js";
 import isAttached from "../core/isAttached.js";
 import getStyles from "./var/getStyles.js";
+import rcustomProp from "./var/rcustomProp.js";
 
 function curCSS( elem, name, computed ) {
-	var ret;
+	var ret,
+		isCustomProp = rcustomProp.test( name );
 
 	computed = computed || getStyles( elem );
 
 	// getPropertyValue is needed for `.css('--customProperty')` (gh-3144)
 	if ( computed ) {
-		ret = computed.getPropertyValue( name );
+		ret = computed.getPropertyValue( name ) || computed[ name ];
 
-		// trim whitespace (issue #4926)
-		ret = ( ret && ret.trim() ) || computed[ name ];
+		// trim whitespace for custom property (issue #4926)
+		if ( isCustomProp ) {
+			ret = ret.trim();
+		}
 
 		if ( ret === "" && !isAttached( elem ) ) {
 			ret = jQuery.style( elem, name );
diff --git a/src/css/var/rcustomProp.js b/src/css/var/rcustomProp.js
@@ -0,0 +1 @@
+export default ( /^--/ );
