diff --git a/core/block.js b/core/block.js
index 501d0e6c1..4730c1cd6 100644
--- a/core/block.js
+++ b/core/block.js
@@ -341,7 +341,7 @@ Blockly.Block.prototype.bumpNeighbours_ = function() {
   if (rootBlock.isInFlyout) {
     return;  // Don't move blocks around in a flyout.
   }
-  // Loop though every connection on this block.
+  // Loop through every connection on this block.
   var myConnections = this.getConnections_(false);
   for (var i = 0, connection; connection = myConnections[i]; i++) {
     // Spider down from this block bumping all sub-blocks.
diff --git a/core/block_render_svg.js b/core/block_render_svg.js
index 14c42b0af..ba99c6594 100644
--- a/core/block_render_svg.js
+++ b/core/block_render_svg.js
@@ -554,7 +554,7 @@ Blockly.BlockSvg.prototype.renderDraw_ = function(iconWidth, inputRows) {
  */
 Blockly.BlockSvg.prototype.renderMoveConnections_ = function() {
   var blockTL = this.getRelativeToSurfaceXY();
-  // Don't tighten previous or output connecitons because they are inferior
+  // Don't tighten previous or output connections because they are inferior
   // connections.
   if (this.previousConnection) {
     this.previousConnection.moveToOffset(blockTL);
diff --git a/core/block_svg.js b/core/block_svg.js
index 8556026fc..e94f5bd43 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -1413,7 +1413,7 @@ Blockly.BlockSvg.prototype.setWarningText = function(text, opt_id) {
   }
   var id = opt_id || '';
   if (!id) {
-    // Kill all previous pending processes, this edit supercedes them all.
+    // Kill all previous pending processes, this edit supersedes them all.
     for (var n in this.setWarningText.pid_) {
       clearTimeout(this.setWarningText.pid_[n]);
       delete this.setWarningText.pid_[n];
diff --git a/core/comment.js b/core/comment.js
index d3e595349..dc650738b 100644
--- a/core/comment.js
+++ b/core/comment.js
@@ -78,7 +78,7 @@ Blockly.Comment.prototype.drawIcon_ = function(group) {
       {'class': 'blocklyIconSymbol',
        'd': 'm6.8,10h2c0.003,-0.617 0.271,-0.962 0.633,-1.266 2.875,-2.405 0.607,-5.534 -3.765,-3.874v1.7c3.12,-1.657 3.698,0.118 2.336,1.25 -1.201,0.998 -1.201,1.528 -1.204,2.19z'},
        group);
-  // Dot of question point.
+  // Dot of question mark.
   Blockly.utils.createSvgElement('rect',
       {'class': 'blocklyIconSymbol',
        'x': '6.8', 'y': '10.78', 'height': '2', 'width': '2'},
diff --git a/core/field_angle.js b/core/field_angle.js
index 4e3fee61c..92d5a8c92 100644
--- a/core/field_angle.js
+++ b/core/field_angle.js
@@ -192,7 +192,7 @@ Blockly.FieldAngle.prototype.onMouseMove = function(e) {
   var dy = e.clientY - bBox.top - Blockly.FieldAngle.HALF;
   var angle = Math.atan(-dy / dx);
   if (isNaN(angle)) {
-    // This shouldn't happen, but let's not let this error propogate further.
+    // This shouldn't happen, but let's not let this error propagate further.
     return;
   }
   angle = goog.math.toDegrees(angle);
diff --git a/core/generator.js b/core/generator.js
index 6d350cc03..d5dd236cc 100644
--- a/core/generator.js
+++ b/core/generator.js
@@ -249,7 +249,7 @@ Blockly.Generator.prototype.valueToCode = function(block, name, outerOrder) {
       // In all known languages multiple such code blocks are not order
       // sensitive.  In fact in Python ('a' 'b') 'c' would fail.
     } else {
-      // The operators outside this code are stonger than the operators
+      // The operators outside this code are stronger than the operators
       // inside this code.  To prevent the code from being pulled apart,
       // wrap the code in parentheses.
       parensNeeded = true;
diff --git a/core/inject.js b/core/inject.js
index fb1955e3e..58787c0b3 100644
--- a/core/inject.js
+++ b/core/inject.js
@@ -263,7 +263,7 @@ Blockly.init_ = function(mainWorkspace) {
   var options = mainWorkspace.options;
   var svg = mainWorkspace.getParentSvg();
 
-  // Supress the browser's context menu.
+  // Suppress the browser's context menu.
   Blockly.bindEventWithChecks_(svg, 'contextmenu', null,
       function(e) {
         if (!Blockly.utils.isTargetInput(e)) {
@@ -327,7 +327,7 @@ Blockly.inject.bindDocumentEvents_ = function() {
     Blockly.bindEventWithChecks_(document, 'touchcancel', null,
         Blockly.longStop_);
     // Don't use bindEvent_ for document's mouseup since that would create a
-    // corresponding touch handler that would squeltch the ability to interact
+    // corresponding touch handler that would squelch the ability to interact
     // with non-Blockly elements.
     document.addEventListener('mouseup', Blockly.onMouseUp_, false);
     // Some iPad versions don't fire resize after portrait to landscape change.
diff --git a/core/mutator.js b/core/mutator.js
index 007665e22..ddaa662af 100644
--- a/core/mutator.js
+++ b/core/mutator.js
@@ -303,7 +303,7 @@ Blockly.Mutator.prototype.workspaceChanged_ = function() {
     block.compose(this.rootBlock_);
     // Restore rendering and show the changes.
     block.rendered = savedRendered;
-    // Mutation may have added some elements that need initalizing.
+    // Mutation may have added some elements that need initializing.
     block.initSvg();
     var newMutationDom = block.mutationToDom();
     var newMutation = newMutationDom && Blockly.Xml.domToText(newMutationDom);
diff --git a/core/toolbox.js b/core/toolbox.js
index be4a0c555..a0ac7a7e8 100644
--- a/core/toolbox.js
+++ b/core/toolbox.js
@@ -330,7 +330,7 @@ Blockly.Toolbox.prototype.syncTrees_ = function(treeIn, treeOut, pathToMedia) {
         }
         if (childIn.getAttribute('expanded') == 'true') {
           if (childOut.blocks.length) {
-            // This is a category that directly contians blocks.
+            // This is a category that directly contains blocks.
             // After the tree is rendered, open this category and show flyout.
             openNode = childOut;
           }
@@ -585,7 +585,7 @@ Blockly.Toolbox.TreeNode = function(toolbox, html, opt_config, opt_domHelper) {
 goog.inherits(Blockly.Toolbox.TreeNode, goog.ui.tree.TreeNode);
 
 /**
- * Supress population of the +/- icon.
+ * Suppress population of the +/- icon.
  * @return {!goog.html.SafeHtml} The source for the icon.
  * @override
  */
@@ -612,7 +612,7 @@ Blockly.Toolbox.TreeNode.prototype.onMouseDown = function(e) {
 };
 
 /**
- * Supress the inherited double-click behaviour.
+ * Suppress the inherited double-click behaviour.
  * @param {!goog.events.BrowserEvent} e The browser event.
  * @override
  * @private
diff --git a/core/tooltip.js b/core/tooltip.js
index e8990595d..84cd2eea0 100644
--- a/core/tooltip.js
+++ b/core/tooltip.js
@@ -160,7 +160,7 @@ Blockly.Tooltip.onMouseOver_ = function(e) {
     Blockly.Tooltip.poisonedElement_ = null;
     Blockly.Tooltip.element_ = element;
   }
-  // Forget about any immediately preceeding mouseOut event.
+  // Forget about any immediately preceding mouseOut event.
   clearTimeout(Blockly.Tooltip.mouseOutPid_);
 };
 
diff --git a/core/workspace_svg.js b/core/workspace_svg.js
index 151b19595..fa55f51aa 100644
--- a/core/workspace_svg.js
+++ b/core/workspace_svg.js
@@ -1270,7 +1270,7 @@ Blockly.WorkspaceSvg.prototype.zoomToFit = function() {
     workspaceWidth -= this.flyout_.width_;
   }
   if (!this.scrollbar) {
-    // Orgin point of 0,0 is fixed, blocks will not scroll to center.
+    // Origin point of 0,0 is fixed, blocks will not scroll to center.
     blocksWidth += metrics.contentLeft;
     blocksHeight += metrics.contentTop;
   }
diff --git a/core/xml.js b/core/xml.js
index e09e2bd01..ecfbe1ed8 100644
--- a/core/xml.js
+++ b/core/xml.js
@@ -362,7 +362,7 @@ Blockly.Xml.domToBlock = function(xmlBlock, workspace) {
       for (var i = blocks.length - 1; i >= 0; i--) {
         blocks[i].render(false);
       }
-      // Populating the connection database may be defered until after the
+      // Populating the connection database may be deferred until after the
       // blocks have rendered.
       setTimeout(function() {
         if (topBlock.workspace) {  // Check that the block hasn't been deleted.
@@ -432,7 +432,7 @@ Blockly.Xml.domToBlockHeadless_ = function(xmlBlock, workspace) {
         if (block.domToMutation) {
           block.domToMutation(xmlChild);
           if (block.initSvg) {
-            // Mutation may have added some elements that need initalizing.
+            // Mutation may have added some elements that need initializing.
             block.initSvg();
           }
         }