Tooltip: Rely on `getBoundingClientRect` for `width` and `height`

Fixes #14553.

js/tests/unit/tooltip.js

@@ -919,4 +919,42 @@ $(function () {
       .bootstrapTooltip('show')
   })
 
+  test('should correctly position tooltips on transformed elements', function () {
+    var styleProps = document.documentElement.style
+    if (!('transform' in styleProps) && !('webkitTransform' in styleProps) && !('msTransform' in styleProps)) {
+      expect(0)
+      return
+    }
+
+    stop()
+
+    var styles = '<style>'
+        + '#qunit-fixture { top: 0; left: 0; }'
+        + '.tooltip, .tooltip *, .tooltip *:before, .tooltip *:after { box-sizing: border-box; }'
+        + '.tooltip { position: absolute; }'
+        + '.tooltip .tooltip-inner { width: 24px; height: 24px; font-family: Helvetica; }'
+        + '#target { position: absolute; top: 100px; left: 50px; width: 100px; height: 200px; -webkit-transform: rotate(270deg); -ms-transform: rotate(270deg); transform: rotate(270deg); }'
+        + '</style>'
+    var $styles = $(styles).appendTo('head')
+
+    var $element = $('<div id="target" title="1"/>').appendTo('#qunit-fixture')
+
+    $element
+      .on('shown.bs.tooltip', function () {
+        var offset = $('.tooltip').offset()
+        $styles.remove()
+        ok(Math.abs(offset.left - 88) <= 1, 'tooltip has correct horizontal location')
+        ok(Math.abs(offset.top - 126) <= 1, 'tooltip has correct vertical location')
+        $element.bootstrapTooltip('hide')
+        start()
+      })
+      .bootstrapTooltip({
+        container: 'body',
+        placement: 'top',
+        trigger: 'manual'
+      })
+
+    $element.bootstrapTooltip('show')
+  })
+
 })

js/tooltip.js

@@ -329,7 +329,6 @@
 
     var el     = $element[0]
     var isBody = el.tagName == 'BODY'
-    var isSvg  = window.SVGElement && el instanceof window.SVGElement
 
     var elRect    = el.getBoundingClientRect()
     if (elRect.width == null) {
@@ -338,10 +337,7 @@
     }
     var elOffset  = isBody ? { top: 0, left: 0 } : $element.offset()
     var scroll    = { scroll: isBody ? document.documentElement.scrollTop || document.body.scrollTop : $element.scrollTop() }
-    var outerDims = isSvg ? {} : {
-      width:  isBody ? $(window).width()  : $element.outerWidth(),
-      height: isBody ? $(window).height() : $element.outerHeight()
-    }
+    var outerDims = isBody ? { width: $(window).width(), height: $(window).height() } : null
 
     return $.extend({}, elRect, scroll, outerDims, elOffset)
   }