javascript-tutorial
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diff --git a/‎2-ui/2-events/01-introduction-browser-events/04-move-ball-field/move-ball-coords.png‎
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diff --git a/‎2-ui/2-events/01-introduction-browser-events/04-move-ball-field/[email protected]‎
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@@ -443,7 +443,7 @@ Let's recap these methods to avoid any confusion:
 
 | method | selects... | negatives |
 |--------|-----------|-----------|
-| `slice(start, end)` | from `start` to `end` | allows negatives |
+| `slice(start, end)` | from `start` to `end` (not including `end`) | allows negatives |
 | `substring(start, end)` | between `start` and `end` | negative values mean `0` |
 | `substr(start, length)` | from `start` get `length` characters | allows negative `start` |
 
 
@@ -22,10 +22,11 @@ function getSecondsToTomorrow() {
   let hour = now.getHours();
   let minutes = now.getMinutes();
   let seconds = now.getSeconds();
-  let totalSecondsToday = (hour * 60 + minutes) * 60 + seconds; 
+  let totalSecondsToday = (hour * 60 + minutes) * 60 + seconds;
   let totalSecondsInADay = 86400;
-  
+
   return totalSecondsInADay - totalSecondsToday;
 }
-
 ```
+
+Please note that many countries have Daylight Savings Time (DST), so there may be days with 23 or 25 hours. We may want to treat such days separately.
@@ -63,7 +63,7 @@ There are only two top-level exclusions:
 
 In other cases everything's straightforward -- if there are spaces (just like any character) in the document, then they become text nodes in DOM, and if we remove them, then there won't be any.
 
-Here are no-space, text-only nodes:
+Here are no space-only text nodes:
 
 ```html no-beautify
 <!DOCTYPE HTML>