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bootstrap/node_modules/has-transitions/index.js

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+/**
+ * This will store the property that the current
+ * browser uses for transitionDuration
+ */
+var property;
+
+/**
+ * The properties we'll check on an element
+ * to determine if it actually has transitions
+ * We use duration as this is the only property
+ * needed to technically have transitions
+ * @type {Array}
+ */
+var types = [
+  "transitionDuration",
+  "MozTransitionDuration",
+  "webkitTransitionDuration"
+];
+
+/**
+ * Determine the correct property for this browser
+ * just once so we done need to check every time
+ */
+while(types.length) {
+  var type = types.shift();
+  if(type in document.body.style) {
+    property = type;
+  }
+}
+
+/**
+ * Determine if the browser supports transitions or
+ * if an element has transitions at all.
+ * @param  {Element}  el Optional. Returns browser support if not included
+ * @return {Boolean}
+ */
+function hasTransitions(el){
+  if(!property) {
+    return false; // No browser support for transitions
+  }
+  if(!el) {
+    return property != null; // We just want to know if browsers support it
+  }
+  var duration = getComputedStyle(el)[property];
+  return duration !== "" && parseFloat(duration) !== 0; // Does this element have transitions?
+}
+
+module.exports = hasTransitions;