akindofcode
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@@ -1143,7 +1143,9 @@ expression will produce, with equal chance, any number from 0 through
 {{index "Math.ceil function", "Math.round function"}}
 
 There are also the functions `Math.ceil` (for "ceiling", which rounds
-up to a whole number) and `Math.round` (to the nearest whole number).
+up to a whole number), `Math.round` (to the nearest whole number), and
+`Math.abs`, which takes the absolute value of a number, meaning it
+negates negative values but leaves positive ones as they are.
 
 ## Destructuring
 
 
@@ -8,7 +8,7 @@ quote}}
 
 # The Document Object Model
 
-// FIXME custom elements, better transitions, maybe `children`, templates, problems with obvious usage
+// FIXME better transitions, maybe `children`, fragments, problems with obvious usage
 
 {{index drawing, parsing}}
 
@@ -161,10 +161,10 @@ numbers to access the child nodes. But it is an instance of the
 
 Then there are issues that are simply poor design. For example, there
 is no way to create a new node and immediately add children or
-attributes to it. Instead, you have to first create it, then add the
-children one by one, and finally set the attributes one by one, using
-side effects. Code that interacts heavily with the DOM tends to get
-long, repetitive, and ugly.
+((attribute))s to it. Instead, you have to first create it, then add
+the children one by one, and finally set the attributes one by one,
+using side effects. Code that interacts heavily with the DOM tends to
+get long, repetitive, and ugly.
 
 {{index library}}
 
@@ -454,7 +454,7 @@ through a ((property)) of the same name on the element's ((DOM))
 object. This is the case for a limited set of commonly used standard
 attributes.
 
-{{index "data attribute", "getAttribute method", "setAttribute method"}}
+{{index "data attribute", "getAttribute method", "setAttribute method", attribute}}
 
 But HTML allows you to set any attribute you want on nodes. This can
 be useful because it allows you to store extra information in a
 
@@ -9,6 +9,8 @@ quote}}
 
 {{index stoicism, "Marcus Aurelius", input, timeline, "control flow"}}
 
+// FIXME mention touch event handling
+
 Some programs work with direct user input, such as mouse and keyboard.
 That kind of input isn't available as a whole at the start of your
 program—it comes in piece by piece, and the program is expected to
@@ -94,6 +96,9 @@ per node that way. The `addEventListener` method allows you to add any
 number of handlers, so you won't accidentally replace a handler that
 has already been registered.
 
+Handlers for most event types can be attached through attributes like
+this, the event name with `on` prefixed.
+
 {{index "removeEventListener method"}}
 
 The `removeEventListener` method, called with arguments similar to as
 
@@ -199,11 +199,11 @@ is replaced by a strange code. Some characters in query strings must
 be escaped. The question mark, represented as `%3F`, is one of those.
 There seems to be an unwritten rule that every format needs its own
 way of escaping characters. This one, called _((URL encoding))_, uses
-a ((percent sign)) followed by two hexadecimal digits that encode the
-character code. In this case, 3F, which is 63 in decimal notation, is
-the code of a question mark character. JavaScript provides the
-`encodeURIComponent` and `decodeURIComponent` functions to encode and
-decode this format.
+a ((percent sign)) followed by two hexadecimal (base 16) digits that
+encode the character code. In this case, 3F, which is 63 in decimal
+notation, is the code of a question mark character. JavaScript
+provides the `encodeURIComponent` and `decodeURIComponent` functions
+to encode and decode this format.
 
 ```
 console.log(encodeURIComponent("Yes?"));