[web-animations-1] Fix a few bikeshed warnings

Author: birtles

web-animations-1/Overview.bs

@@ -603,8 +603,8 @@ a {{Document}} |doc| at timestamp |now|, run these steps:
      <a lt="timeline current time">current time</a> of a [=timeline=] also
      involves:
 
-     *    Updating the [=current time=] of any [=animations=] associated with
-          the timeline.
+     *    Updating the [=current time=] of any [=animations=] <a lt="associated
+          with a timeline">associated with</a> the timeline.
      *    Running the [=update an animation's finished state=] procedure for any
           animations whose [=current time=] has been updated.
      *    Queueing [=animation events=] for any such animations.
@@ -3053,7 +3053,7 @@ types</a>.
 
 For <a>animation types</a> that do not define a specific procedure
 for <a lt="animation addition">addition</a> or which are defined as
-<dfn>not additive</dfn>, the <a
+<dfn export>not additive</dfn>, the <a
 lt="animation addition">addition procedure</a> is simply
 <var>V</var><sub>res</sub> = <var>V</var><sub>b</sub>.
 
@@ -5018,7 +5018,7 @@ typedef (sequence&lt;Keyframe&gt; or PropertyIndexedKeyframes) KeyframeArgument;
 
 The meaning and allowed values of each argument is as follows:
 
-:   <dfn id="dom-keyframe-offset">offset</dfn>
+:   offset
 ::  The <a>keyframe offset</a> of the <a>keyframe</a> specified as
     a number between 0.0 and 1.0 inclusive or <code>null</code>.
 
@@ -5031,15 +5031,15 @@ The meaning and allowed values of each argument is as follows:
     Keyframes that specify an offset must be provided in increasing
     order of offset. Adjacent and equal offsets, however, are permitted.
 
-:   <dfn id="dom-keyframe-easing">easing</dfn>
+:   easing
 ::  The <a>timing function</a> used to transform the progress of time
     from this keyframe until the next keyframe in the series.
 
     The syntax and error-handling associated with parsing this string
     is identical to that defined for the {{EffectTiming/easing}} attribute
     of the {{EffectTiming}} interface.
 
-:   <dfn id="dom-keyframe-composite">composite</dfn>
+:   composite
 ::  The <a>keyframe-specific composite operation</a> used to combine the values
     specified in this keyframe with the <a>underlying value</a>.
 
@@ -5893,7 +5893,7 @@ additional technologies defined in terms of this specification in
 which case the definitions provided in this specification will form
 part of the conformance criteria of the additional technology.
 
-A <dfn>conforming scripted Web Animations user agent</dfn> is a user
+A <dfn export>conforming scripted Web Animations user agent</dfn> is a user
 agent that implements the <abbr
 title="Application Programming Interface">API</abbr> defined in
 [[#programming-interface]].