Index: node_modules/d3-selection/src/selection/style.js
===================================================================
--- node_modules/d3-selection/src/selection/style.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-selection/src/selection/style.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,35 @@
+import defaultView from "../window.js";
+
+function styleRemove(name) {
+  return function() {
+    this.style.removeProperty(name);
+  };
+}
+
+function styleConstant(name, value, priority) {
+  return function() {
+    this.style.setProperty(name, value, priority);
+  };
+}
+
+function styleFunction(name, value, priority) {
+  return function() {
+    var v = value.apply(this, arguments);
+    if (v == null) this.style.removeProperty(name);
+    else this.style.setProperty(name, v, priority);
+  };
+}
+
+export default function(name, value, priority) {
+  return arguments.length > 1
+      ? this.each((value == null
+            ? styleRemove : typeof value === "function"
+            ? styleFunction
+            : styleConstant)(name, value, priority == null ? "" : priority))
+      : styleValue(this.node(), name);
+}
+
+export function styleValue(node, name) {
+  return node.style.getPropertyValue(name)
+      || defaultView(node).getComputedStyle(node, null).getPropertyValue(name);
+}