diff --git a/1-js/02-first-steps/01-hello-world/article.md b/1-js/02-first-steps/01-hello-world/article.md
index fa935f34..35f82bf5 100644
--- a/1-js/02-first-steps/01-hello-world/article.md
+++ b/1-js/02-first-steps/01-hello-world/article.md
@@ -73,7 +73,7 @@ Script files are attached to HTML with the `src` attribute:
 <script src="/path/to/script.js"></script>
 ```
 
-Here, `/path/to/script.js` is an absolute path to the script from the site root. One can also provide a relative path from the current page. For instance, `src="script.js"` would mean a file `"script.js"` in the current folder.
+Here, `/path/to/script.js` is an absolute path to the script from the site root. One can also provide a relative path from the current page. For instance, `src="script.js"`, just like `src="./script.js"`, would mean a file `"script.js"` in the current folder.
 
 We can give a full URL as well. For instance:
 
diff --git a/1-js/11-async/02-promise-basics/03-animate-circle-promise/solution.view/index.html b/1-js/11-async/02-promise-basics/03-animate-circle-promise/solution.view/index.html
index 3229daf8..6052f009 100644
--- a/1-js/11-async/02-promise-basics/03-animate-circle-promise/solution.view/index.html
+++ b/1-js/11-async/02-promise-basics/03-animate-circle-promise/solution.view/index.html
@@ -10,7 +10,7 @@
       text-align: center;
     }
     .circle {
-      transition-property: width, height, margin-left, margin-top;
+      transition-property: width, height;
       transition-duration: 2s;
       position: fixed;
       transform: translateX(-50%) translateY(-50%);
diff --git a/2-ui/2-events/01-introduction-browser-events/07-carousel/solution.view/index.html b/2-ui/2-events/01-introduction-browser-events/07-carousel/solution.view/index.html
index 2c607331..baf86766 100644
--- a/2-ui/2-events/01-introduction-browser-events/07-carousel/solution.view/index.html
+++ b/2-ui/2-events/01-introduction-browser-events/07-carousel/solution.view/index.html
@@ -10,7 +10,7 @@
   <div id="carousel" class="carousel">
     <button class="arrow prev">⇦</button>
     <div class="gallery">
-      <ul class="images">
+      <ul>
         <li><img src="https://en.js.cx/carousel/1.png"></li>
         <li><img src="https://en.js.cx/carousel/2.png"></li>
         <li><img src="https://en.js.cx/carousel/3.png"></li>
diff --git a/2-ui/3-event-details/3-mousemove-mouseover-mouseout-mouseenter-mouseleave/2-hoverintent/solution.view/hoverIntent.js b/2-ui/3-event-details/3-mousemove-mouseover-mouseout-mouseenter-mouseleave/2-hoverintent/solution.view/hoverIntent.js
index 4e6e2a3e..7503ca9c 100644
--- a/2-ui/3-event-details/3-mousemove-mouseover-mouseout-mouseenter-mouseleave/2-hoverintent/solution.view/hoverIntent.js
+++ b/2-ui/3-event-details/3-mousemove-mouseover-mouseout-mouseenter-mouseleave/2-hoverintent/solution.view/hoverIntent.js
@@ -88,7 +88,7 @@ class HoverIntent {
     if (speed < this.sensitivity) {
       clearInterval(this.checkSpeedInterval);
       this.isHover = true;
-      this.over.call(this.elem, event);
+      this.over.call(this.elem);
     } else {
       // speed fast, remember new coordinates as the previous ones
       this.prevX = this.lastX;
diff --git a/4-binary/01-arraybuffer-binary-arrays/article.md b/4-binary/01-arraybuffer-binary-arrays/article.md
index accd3c50..95c18dda 100644
--- a/4-binary/01-arraybuffer-binary-arrays/article.md
+++ b/4-binary/01-arraybuffer-binary-arrays/article.md
@@ -126,9 +126,9 @@ new TypedArray();
 
 We can create a `TypedArray` directly, without mentioning `ArrayBuffer`. But a view cannot exist without an underlying `ArrayBuffer`, so gets created automatically in all these cases except the first one (when provided).
 
-To access the `ArrayBuffer`, there are properties:
-- `arr.buffer` -- references the `ArrayBuffer`.
-- `arr.byteLength` -- the length of the `ArrayBuffer`.
+To access the underlying `ArrayBuffer`, there are following properties in `TypedArray`:
+- `buffer` -- references the `ArrayBuffer`.
+- `byteLength` -- the length of the `ArrayBuffer`.
 
 So, we can always move from one view to another:
 ```js
diff --git a/7-animation/2-css-animations/3-animate-circle/solution.view/index.html b/7-animation/2-css-animations/3-animate-circle/solution.view/index.html
index 88b15425..43b927e8 100644
--- a/7-animation/2-css-animations/3-animate-circle/solution.view/index.html
+++ b/7-animation/2-css-animations/3-animate-circle/solution.view/index.html
@@ -5,7 +5,7 @@
   <meta charset="utf-8">
   <style>
     .circle {
-      transition-property: width, height, margin-left, margin-top;
+      transition-property: width, height;
       transition-duration: 2s;
       position: fixed;
       transform: translateX(-50%) translateY(-50%);
diff --git a/7-animation/2-css-animations/3-animate-circle/source.view/index.html b/7-animation/2-css-animations/3-animate-circle/source.view/index.html
index a423280d..e305f4cf 100644
--- a/7-animation/2-css-animations/3-animate-circle/source.view/index.html
+++ b/7-animation/2-css-animations/3-animate-circle/source.view/index.html
@@ -5,7 +5,7 @@
   <meta charset="utf-8">
   <style>
     .circle {
-      transition-property: width, height, margin-left, margin-top;
+      transition-property: width, height;
       transition-duration: 2s;
       position: fixed;
       transform: translateX(-50%) translateY(-50%);
diff --git a/7-animation/2-css-animations/4-animate-circle-callback/solution.view/index.html b/7-animation/2-css-animations/4-animate-circle-callback/solution.view/index.html
index b2192681..64746e85 100644
--- a/7-animation/2-css-animations/4-animate-circle-callback/solution.view/index.html
+++ b/7-animation/2-css-animations/4-animate-circle-callback/solution.view/index.html
@@ -10,7 +10,7 @@
       text-align: center;
     }
     .circle {
-      transition-property: width, height, margin-left, margin-top;
+      transition-property: width, height;
       transition-duration: 2s;
       position: fixed;
       transform: translateX(-50%) translateY(-50%);
diff --git a/7-animation/3-js-animation/1-animate-ball/solution.view/index.html b/7-animation/3-js-animation/1-animate-ball/solution.view/index.html
index 7e031e8d..146033cf 100644
--- a/7-animation/3-js-animation/1-animate-ball/solution.view/index.html
+++ b/7-animation/3-js-animation/1-animate-ball/solution.view/index.html
@@ -21,7 +21,7 @@
     }
 
     function bounce(timeFraction) {
-      for (let a = 0, b = 1, result; 1; a += b, b /= 2) {
+      for (let a = 0, b = 1; 1; a += b, b /= 2) {
         if (timeFraction >= (7 - 4 * a) / 11) {
           return -Math.pow((11 - 6 * a - 11 * timeFraction) / 4, 2) + Math.pow(b, 2)
         }
diff --git a/7-animation/3-js-animation/2-animate-ball-hops/solution.view/index.html b/7-animation/3-js-animation/2-animate-ball-hops/solution.view/index.html
index b246f422..f587ff60 100644
--- a/7-animation/3-js-animation/2-animate-ball-hops/solution.view/index.html
+++ b/7-animation/3-js-animation/2-animate-ball-hops/solution.view/index.html
@@ -21,7 +21,7 @@
     }
 
     function bounce(timeFraction) {
-      for (let a = 0, b = 1, result; 1; a += b, b /= 2) {
+      for (let a = 0, b = 1; 1; a += b, b /= 2) {
         if (timeFraction >= (7 - 4 * a) / 11) {
           return -Math.pow((11 - 6 * a - 11 * timeFraction) / 4, 2) + Math.pow(b, 2)
         }
diff --git a/7-animation/3-js-animation/article.md b/7-animation/3-js-animation/article.md
index 517b2481..5450d904 100644
--- a/7-animation/3-js-animation/article.md
+++ b/7-animation/3-js-animation/article.md
@@ -283,7 +283,7 @@ The `bounce` function does the same, but in the reverse order: "bouncing" starts
 
 ```js
 function bounce(timeFraction) {
-  for (let a = 0, b = 1, result; 1; a += b, b /= 2) {
+  for (let a = 0, b = 1; 1; a += b, b /= 2) {
     if (timeFraction >= (7 - 4 * a) / 11) {
       return -Math.pow((11 - 6 * a - 11 * timeFraction) / 4, 2) + Math.pow(b, 2)
     }
diff --git a/7-animation/3-js-animation/bounce-easeinout.view/index.html b/7-animation/3-js-animation/bounce-easeinout.view/index.html
index 837c50db..aed3d9d0 100644
--- a/7-animation/3-js-animation/bounce-easeinout.view/index.html
+++ b/7-animation/3-js-animation/bounce-easeinout.view/index.html
@@ -26,7 +26,7 @@
 
 
     function bounce(timeFraction) {
-      for (let a = 0, b = 1, result; 1; a += b, b /= 2) {
+      for (let a = 0, b = 1; 1; a += b, b /= 2) {
         if (timeFraction >= (7 - 4 * a) / 11) {
           return -Math.pow((11 - 6 * a - 11 * timeFraction) / 4, 2) + Math.pow(b, 2)
         }
diff --git a/7-animation/3-js-animation/bounce-easeout.view/index.html b/7-animation/3-js-animation/bounce-easeout.view/index.html
index e52eae8d..69dbb7ce 100644
--- a/7-animation/3-js-animation/bounce-easeout.view/index.html
+++ b/7-animation/3-js-animation/bounce-easeout.view/index.html
@@ -22,7 +22,7 @@
     }
 
     function bounce(timeFraction) {
-      for (let a = 0, b = 1, result; 1; a += b, b /= 2) {
+      for (let a = 0, b = 1; 1; a += b, b /= 2) {
         if (timeFraction >= (7 - 4 * a) / 11) {
           return -Math.pow((11 - 6 * a - 11 * timeFraction) / 4, 2) + Math.pow(b, 2)
         }
diff --git a/7-animation/3-js-animation/bounce.view/index.html b/7-animation/3-js-animation/bounce.view/index.html
index 1be2580d..3575ed82 100644
--- a/7-animation/3-js-animation/bounce.view/index.html
+++ b/7-animation/3-js-animation/bounce.view/index.html
@@ -19,7 +19,7 @@
       animate({
         duration: 3000,
         timing: function bounce(timeFraction) {
-          for (let a = 0, b = 1, result; 1; a += b, b /= 2) {
+          for (let a = 0, b = 1; 1; a += b, b /= 2) {
             if (timeFraction >= (7 - 4 * a) / 11) {
               return -Math.pow((11 - 6 * a - 11 * timeFraction) / 4, 2) + Math.pow(b, 2)
             }
diff --git a/7-animation/3-js-animation/text.view/index.html b/7-animation/3-js-animation/text.view/index.html
index e404fe5c..001b0ae9 100644
--- a/7-animation/3-js-animation/text.view/index.html
+++ b/7-animation/3-js-animation/text.view/index.html
@@ -36,7 +36,7 @@ And stood awhile in thought.
 
 
     function bounce(timeFraction) {
-      for (let a = 0, b = 1, result; 1; a += b, b /= 2) {
+      for (let a = 0, b = 1; 1; a += b, b /= 2) {
         if (timeFraction >= (7 - 4 * a) / 11) {
           return -Math.pow((11 - 6 * a - 11 * timeFraction) / 4, 2) + Math.pow(b, 2)
         }