[css-color-4] clean up hue angle markup

Author: svgeesus

css-color-4/Overview.bs

@@ -4527,8 +4527,18 @@ Hue interpolation</h3>
 	Unless the type of hue interpolation is ''specified'', both angles need to be constrained to [0, 360) prior to interpolation.
 	One way to do this is <code><i>θ</i> = ((<i>θ</i> % 360) + 360) % 360</code>.
 
-	: ''shorter''
-	:: Angles are adjusted so that θ₂ - θ₁ ∈ [-180, 180]. In pseudo-Javascript:
+	Unless otherwise specified, if no specific hue interpolation algorithm is selected by the host syntax, the default is ''shorter''.
+
+	If one of the angles has the value NaN,
+	then for interpolation, NaN is replaced
+	by the value of the other hue angle.
+	If both angles have the value NaN,
+	then for interpolation, NaN is replaced
+	by the value 0 for both angles.
+
+	<h4 id="hue-shorter">''shorter''"</h4>
+
+	Angles are adjusted so that θ₂ - θ₁ ∈ [-180, 180]. In pseudo-Javascript:
 		<pre>
 		if (θ₂ - θ₁ > 180) {
 			θ₁ += 360;
@@ -4538,8 +4548,9 @@ Hue interpolation</h3>
 		}
 		</pre>
 
-	: ''longer''
-	:: Angles are adjusted so that |θ₂ - θ₁| ∈ {0, [180, 360)}. In pseudo-Javascript:
+	<h4 id="hue-longer">''longer''</h4>
+
+	Angles are adjusted so that |θ₂ - θ₁| ∈ {0, [180, 360)}. In pseudo-Javascript:
 		<pre>
 		if (0 < θ₂ - θ₁ < 180) {
 			θ₁ += 360;
@@ -4549,33 +4560,28 @@ Hue interpolation</h3>
 		}
 		</pre>
 
-	: ''increasing''
-	:: Angles are adjusted so that θ₂ - θ₁ ∈ [0, 360). In pseudo-Javascript:
+	<h4 id="hue-increasing">''increasing''</h4>
+
+	Angles are adjusted so that θ₂ - θ₁ ∈ [0, 360). In pseudo-Javascript:
 		<pre>
 		if (θ₂ < θ₁) {
 			θ₂ += 360;
 		}
 		</pre>
 
-	: ''decreasing''
-	:: Angles are adjusted so that θ₂ - θ₁ ∈ (-360, 0]. In pseudo-Javascript:
+	<h4 id="hue-decreasing">''decreasing''</h4>
+
+	Angles are adjusted so that θ₂ - θ₁ ∈ (-360, 0]. In pseudo-Javascript:
 		<pre>
 		if (θ₁ < θ₂) {
 			θ₁ += 360;
 		}
 		</pre>
 
-	: ''specified''
-	:: No fixup is performed. Angles are interpolated in the same way as every other component.
+	<h4 id="hue-specified">''specified''</h4>
 
-	Unless otherwise specified, if no specific hue interpolation algorithm is selected by the host syntax, the default is ''shorter''.
+	No fixup is performed. Angles are interpolated in the same way as every other component.
 
-	If one of the angles has the value NaN,
-	then for interpolation, NaN is replaced
-	by the value of the other hue angle.
-	If both angles have the value NaN,
-	then for interpolation, NaN is replaced
-	by the value 0 for both angles.
 
 	Issue(#4928):