diff --git a/lib/widget.js b/lib/widget.js
index 8a2b76a..e73ab35 100644
--- a/lib/widget.js
+++ b/lib/widget.js
@@ -638,14 +638,25 @@ Element.prototype.setContent = function(content) {
     ret.yl - (this.border ? 1 : 0));
 };
 
+/**
+ * Positioning
+ */
+
+// NOTE: When coords are entered in the Element constructor, all of the coords
+// are *relative* to their parent, when retrieving them from `.left`, `.right`,
+// etc members, the coords are absolute. To see the *relative* coords again,
+// use `.rleft`, `.rright`, etc.
+
 Element.prototype.__defineGetter__('left', function() {
   var left = this.position.left;
 
   if (typeof left === 'string') {
     if (left === 'center') left = '50%';
     left = +left.slice(0, -1) / 100;
-    var len = Math.min(this.width, this.parent.width);
-    left = (this.parent.width - len) * left | 0;
+    left = Math.max(this.width, this.parent.width) * left | 0;
+    if (this.position.left === 'center') {
+      left -= this.width / 2 | 0;
+    }
   }
 
   if (this.options.left == null && this.options.right != null) {
@@ -656,9 +667,9 @@ Element.prototype.__defineGetter__('left', function() {
 });
 
 Element.prototype.__defineGetter__('right', function() {
-  //if (this.options.right == null && this.options.left != null) {
-  //  return this.screen.cols - (this.left + this.width);
-  //}
+  if (this.options.right == null && this.options.left != null) {
+    return this.screen.cols - (this.left + this.width);
+  }
   return (this.parent.right || 0) + this.position.right;
 });
 
@@ -668,8 +679,10 @@ Element.prototype.__defineGetter__('top', function() {
   if (typeof top === 'string') {
     if (top === 'center') top = '50%';
     top = +top.slice(0, -1) / 100;
-    var len = Math.min(this.height, this.parent.height);
-    top = (this.parent.height - len) * top | 0;
+    top = Math.max(this.height, this.parent.height) * top | 0;
+    if (this.position.top === 'center') {
+      top -= this.height / 2 | 0;
+    }
   }
 
   if (this.options.top == null && this.options.bottom != null) {
@@ -680,9 +693,9 @@ Element.prototype.__defineGetter__('top', function() {
 });
 
 Element.prototype.__defineGetter__('bottom', function() {
-  //if (this.options.bottom == null && this.options.top != null) {
-  //  return this.screen.rows - (this.top + this.height);
-  //}
+  if (this.options.bottom == null && this.options.top != null) {
+    return this.screen.rows - (this.top + this.height);
+  }
   return (this.parent.bottom || 0) + this.position.bottom;
 });
 
@@ -732,8 +745,10 @@ Element.prototype.__defineGetter__('rleft', function() {
   if (typeof left === 'string') {
     if (left === 'center') left = '50%';
     left = +left.slice(0, -1) / 100;
-    var len = Math.min(this.width, this.parent.width);
-    left = len * left | 0;
+    left = Math.max(this.width, this.parent.width) * left | 0;
+    if (this.position.left === 'center') {
+      left -= this.width / 2 | 0;
+    }
   }
 
   if (this.options.left == null && this.options.right != null) {
@@ -744,6 +759,9 @@ Element.prototype.__defineGetter__('rleft', function() {
 });
 
 Element.prototype.__defineGetter__('rright', function() {
+  if (this.options.right == null && this.options.left != null) {
+    return this.parent.width - (this.rleft + this.width);
+  }
   return this.position.right;
 });
 
@@ -753,8 +771,10 @@ Element.prototype.__defineGetter__('rtop', function() {
   if (typeof top === 'string') {
     if (top === 'center') top = '50%';
     top = +top.slice(0, -1) / 100;
-    var len = Math.min(this.height, this.parent.height);
-    top = len * top | 0;
+    top = Math.max(this.height, this.parent.height) * top | 0;
+    if (this.position.top === 'center') {
+      top -= this.height / 2 | 0;
+    }
   }
 
   if (this.options.top == null && this.options.bottom != null) {
@@ -765,6 +785,9 @@ Element.prototype.__defineGetter__('rtop', function() {
 });
 
 Element.prototype.__defineGetter__('rbottom', function() {
+  if (this.options.bottom == null && this.options.top != null) {
+    return this.parent.height - (this.rtop + this.height);
+  }
   return this.position.bottom;
 });
 
@@ -773,10 +796,17 @@ Element.prototype.__defineGetter__('rbottom', function() {
 // TODO: Optimize clearing to only clear what is necessary.
 
 Element.prototype.__defineSetter__('left', function(val) {
+  if (typeof val === 'string') {
+    if (val === 'center') val = '50%';
+    val = +val.slice(0, -1) / 100;
+    val = this.screen.width * val | 0;
+    //val = val - this.parent.left;
+  }
   this.emit('move');
   this.screen.clearRegion(this.left, this.left + this.width, this.top, this.top + this.height);
-  var left = this.left;
-  return this.options.left = this.position.left = left + (val - left);
+  //var left = this.left;
+  //return this.options.left = this.position.left = left + (val - left);
+  return this.options.left = this.position.left = val - this.parent.left;
   // More efficient clearing:
   // if (left > this.left) {
   //   this.screen.clearRegion(this.left + this.width, left + this.width, this.top, this.top + this.height);
@@ -786,30 +816,51 @@ Element.prototype.__defineSetter__('left', function(val) {
 });
 
 Element.prototype.__defineSetter__('right', function(val) {
+  if (typeof val === 'string') {
+    if (val === 'center') val = '50%';
+    val = +val.slice(0, -1) / 100;
+    val = this.screen.width * val | 0;
+    //val = val - this.parent.right;
+  }
   this.emit('move');
   this.screen.clearRegion(
     this.left, this.left + this.width,
     this.top, this.top + this.height);
-  var right = this.right;
-  return this.options.right = this.position.right = right + (val - right);
+  //var right = this.right;
+  //return this.options.right = this.position.right = right + (val - right);
+  return this.options.right = this.position.right = val - this.parent.right;
 });
 
 Element.prototype.__defineSetter__('top', function(val) {
+  if (typeof val === 'string') {
+    if (val === 'center') val = '50%';
+    val = +val.slice(0, -1) / 100;
+    val = this.screen.height * val | 0;
+    //val = val - this.parent.top;
+  }
   this.emit('move');
   this.screen.clearRegion(
     this.left, this.left + this.width,
     this.top, this.top + this.height);
-  var top = this.top;
-  return this.options.top = this.position.top = top + (val - top);
+  //var top = this.top;
+  //return this.options.top = this.position.top = top + (val - top);
+  return this.options.top = this.position.top = val - this.parent.top;
 });
 
 Element.prototype.__defineSetter__('bottom', function(val) {
+  if (typeof val === 'string') {
+    if (val === 'center') val = '50%';
+    val = +val.slice(0, -1) / 100;
+    val = this.screen.height * val | 0;
+    //val = val - this.parent.bottom;
+  }
   this.emit('move');
   this.screen.clearRegion(
     this.left, this.left + this.width,
     this.top, this.top + this.height);
-  var bottom = this.bottom;
-  return this.options.bottom = this.position.bottom = bottom + (val - bottom);
+  //var bottom = this.bottom;
+  //return this.options.bottom = this.position.bottom = bottom + (val - bottom);
+  return this.options.bottom = this.position.bottom = val - this.parent.bottom;
 });
 
 Element.prototype.__defineSetter__('width', function(val) {
diff --git a/test/widget-pos.js b/test/widget-pos.js
index 708d008..dc9ae57 100644
--- a/test/widget-pos.js
+++ b/test/widget-pos.js
@@ -1,13 +1,16 @@
 var blessed = require('blessed')
-  , program = blessed();
+  , program = blessed()
+  , assert = require('assert');
 
 var screen = new blessed.Screen({
   program: program
 });
 
 var main = new blessed.Box({
-  width: '75%',
-  height: '75%',
+  //width: '75%',
+  //height: '75%',
+  width: 115,
+  height: 14,
   bg: 3,
   top: 2,
   left: 2,
@@ -19,6 +22,8 @@ screen.append(main);
 var inner = new blessed.Box({
   width: '50%',
   height: '50%',
+  //width: 57,
+  //height: 7,
   bg: 4,
   top: 2,
   left: 2,
@@ -40,6 +45,50 @@ inner.setContent(inner.content + '\n' + JSON.stringify({
   rbottom: inner.rbottom
 }));
 
+// NOTE: With 154 cols.
+program.cols = 154;
+program.rows = 19;
+
+assert.equal(inner.width, 57);
+assert.equal(inner.height, 7);
+
+assert.equal(inner.left, 4);
+assert.equal(inner.right, 93);
+assert.equal(inner.top, 4);
+assert.equal(inner.bottom, 8);
+
+assert.equal(inner.rleft, 2);
+assert.equal(inner.rright, 56);
+assert.equal(inner.rtop, 2);
+assert.equal(inner.rbottom, 5);
+
+// Change left to half of the parent width.
+inner.rleft = '50%';
+assert.equal(inner.left, 59);
+
+// Change left to half of the screen width.
+inner.left = '50%';
+assert.equal(inner.left, screen.width / 2 | 0);
+
+// Test implied height/width.
+reset(inner, {
+  top: 5,
+  bottom: 5,
+  left: 5,
+  right: 5
+});
+
+assert.equal(inner.width, 105);
+assert.equal(inner.height, 4);
+
+// Demonstrate the difference between `left: 5`, and `.left = 5` (relative vs. absolute):
+inner.top = inner.bottom = inner.left = inner.right = 5;
+
+assert.equal(inner.width, 144);
+assert.equal(inner.height, 9);
+
+// TODO: Start storing position.left, etc. as absolute?
+
 screen.on('keypress', function(ch, key) {
   if (key.name === 'escape' || key.name === 'q') {
     return process.exit(0);
@@ -47,3 +96,12 @@ screen.on('keypress', function(ch, key) {
 });
 
 screen.render();
+
+function reset(el, pos) {
+  el.position.width = el.options.width = pos.width;
+  el.position.height = el.options.height = pos.height;
+  el.position.left = el.options.left = pos.left;
+  el.position.right = el.options.right = pos.right;
+  el.position.top = el.options.top = pos.top;
+  el.position.bottom = el.options.bottom = pos.bottom;
+}
diff --git a/test/widget.js b/test/widget.js
index e9909b4..fd53c78 100644
--- a/test/widget.js
+++ b/test/widget.js
@@ -231,6 +231,3 @@ setInterval(function() {
   setTimeout(fill, 300);
   progress.top -= 2;
 })();
-
-setTimeout(function() {
-}, 2000);