NNTP: Lots of small tweaks...

chrome/browser/resources/new_new_tab.css

 html {
   /* This is needed because of chrome://theme/css/new_tab.css */
   height: 100%;
 }
 
 body {
   margin: 0;
 }
 
 #main {
   background: url(chrome://theme/product_logo) no-repeat 0 0px;
   position: relative;
   margin: 0 auto;
   width: 940px;
-  -webkit-transition: width .5s;
+  -webkit-transition: width .15s;
 }
 
 html[dir='rtl'] #main {
   background-position-x: 100%;
 }
 
 html[anim='false'] *,
 .no-anim, .no-anim *,
 .loading * {
   -webkit-transition: none !important;
   -webkit-animation: none !important;
 }
 
 /* Most Visited */
 
 #most-visited {
   position: relative;
   padding: 0;
   margin-bottom: 34px;
   height: 372px;
   -webkit-user-select: none;
-  -webkit-transition: height .5s, opacity .5s;
-}
-
-@-webkit-keyframes 'thumbnail-enter' {
-  /* 2.5s */
-  0%, 20% {
-    -webkit-box-shadow: 0px 2px 2px hsla(0, 0%, 0%, .5);
-    -webkit-border-radius: 4px;
-  }
-
-  100% {
-    -webkit-border-top-left-radius: 0;
-    -webkit-border-top-right-radius: 0;
-    -webkit-box-shadow: 0px 2px 2px hsla(0, 0%, 0%, 0);
-  }
-}
-
-@-webkit-keyframes 'edit-mode-border-enter' {
-  /* 2.5s */
-  0%, 20% {
-    background-color: hsla(213, 66%, 57%, 0);
-    -webkit-box-shadow: 0px 2px 2px hsla(0, 0%, 0%, 0);
-  }
-
-  100% {
-    background-color: hsla(213, 66%, 57%, 1);
-    -webkit-box-shadow: 0px 2px 2px hsla(0, 0%, 0%, .5);
-  }
-}
-
-@-webkit-keyframes 'edit-bar-enter' {
-  /* 2.5s */
-  0%, 20% {
-    opacity: 0;
-    pointer-events: none;
-  }
-
-  100% {
-    opacity: 1;
-    pointer-events: inherit;
-  }
+  -webkit-transition: height .15s, opacity .15s;
 }
 
 .thumbnail-container {
   position: absolute;
-  -webkit-transition: top .5s, left .5s;
+  -webkit-transition: top .15s, left .15s;
   color: black;
   text-decoration: none;
-  -webkit-transition: left .5s, top .5s;
+  -webkit-transition: left .15s, top .15s;
 }
 
 .list > .thumbnail-container {
-  -webkit-transition: left .5s, top .5s, width .5s;
+  -webkit-transition: left .15s, top .15s, width .15s;
+  overflow: hidden;
+}
+
+/* hide outline in thumbnail view */
+:not(.list) > .thumbnail-container:focus {
+  outline: none;
 }
 
 .thumbnail,
 .thumbnail-container > .title {
   width: 212px; /* natural size is 196 */
   height: 132px; /* 136 */
-  -webkit-transition: width .5s, height .5s;
+  -webkit-transition: width .15s, height .15s;
 }
 
 .thumbnail-wrapper {
   display: block;
   -webkit-background-size: 212px 132px;
   background: no-repeat 4px 4px;
   background-color: white;
   -webkit-border-radius: 5px;
-  -webkit-transition: -webkit-background-size .5s;
+  -webkit-transition: -webkit-background-size .15s;
+  position: relative;
 }
 
 .filler * {
   visibility: hidden;
 }
 
 .filler {
   pointer-events: none;
 }
 
 .filler .thumbnail-wrapper {
   visibility: inherit;
   border: 1px solid hsl(0, 0%, 90%);
   background-color: hsl(0, 0%, 95%);
   -webkit-border-radius: 2px;
   display: block;
 }
 
 .filler .thumbnail {
   visibility: visible;
   border-color: hsl(0, 0%, 90%);
   background-color: hsl(0, 0%, 95%);
 }
 
 .edit-bar {
-  opacity: 0;
-  pointer-events: none;
   display: -webkit-box;
   -webkit-box-orient: horizontal;
   -webkit-box-align: stretch;
   padding: 3px;
   padding-bottom: 0;
   height: 17px; /* 23 - 2 * 3 */
-  -webkit-transition: opacity .5s;
   cursor: move;
   font-size: 100%;
   line-height: 17px;
-  background-image: -webkit-gradient(linear, left top, left bottom,
-                                     from(hsl(213, 87%, 67%)),
-                                     to(hsl(213, 66%, 57%)));
+  background: hsl(213, 54%, 95%);
   -webkit-border-top-left-radius: 4px;
   -webkit-border-top-right-radius: 4px;
+  position: relative;
+  margin-top: 21px;
+  margin-bottom: -21px;
+  -webkit-transition: margin .15s, background .15s;
 }
 
 .edit-bar > * {
   display: block;
   position: relative;
 }
 
+.thumbnail-container:focus .edit-bar,
 .thumbnail-container:hover .edit-bar {
-  -webkit-animation: 'edit-bar-enter' 2.5s;
-  opacity: 1;
-  pointer-events: inherit;
+  margin-top: 0;
+  margin-bottom: 0;
+  -webkit-transition-delay: .5s, 0s;
+
+  /* We need background-color as well to get the fade out animation correct */
+  background-color: hsl(213, 66%, 57%);
+  background-image: -webkit-gradient(linear, left top, left bottom,
+                                     from(hsl(213, 87%, 67%)),
+                                     to(hsl(213, 66%, 57%)));
 }
 
 .edit-bar > .spacer {
   -webkit-box-flex: 1;
 }
 
 .edit-bar > .pin,
 .edit-bar > .remove {
   width: 16px;
   height: 16px;
@@ skipping 38 matching lines @@
 }
 
 :link,
 :visited,
 .link {
   cursor: pointer;
   text-decoration: underline;
   color: hsl(213, 90%, 24%);
 }
 
+.thumbnail-container {
+  text-decoration: none;
+}
+
 .thumbnail-container > .title {
   line-height: 16px;
   height: 16px;
   margin: 0;
   margin-top: 4px;
   font-size: 100%;
-  font-weight:normal;
+  font-weight: normal;
   padding: 0 3px;
   opacity: 1;
-  -webkit-transition: opacity .5s, width .5s;
+  -webkit-transition: opacity .15s, width .15s;
   color: black;
 }
 
 .thumbnail-container > .title > div {
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
 
   background: no-repeat 0 50%;
   -webkit-background-size: 16px;
   padding-left: 20px; /* we cannot use padding start here because even if we set
                          the direction we always want the icon on the same side
                       */
   padding-right: 0;
 }
 
 html[dir=rtl] .thumbnail-container > .title > div {
   background-position-x: 100%;
   padding-left: 0;
   padding-right: 20px;
   text-align: right;
 }
 
 .thumbnail {
-  border: 3px solid hsla(213, 63%, 93%, 1);
+  border: 3px solid hsl(213, 63%, 93%);
   padding: 1px;
   -webkit-border-radius: 5px;
   display: block;
   -webkit-box-shadow: 0px 2px 2px hsla(0, 0%, 0%, 0);
-  -webkit-transition: width .5s, height .5s, border-color .5s,
-      -webkit-border-radius .5s, -webkit-box-shadow .5s;
+  -webkit-transition: width .15s, height .15s, border-color .15s,
+      -webkit-border-radius .15s, -webkit-box-shadow .15s;
 }
 
 .edit-mode-border {
   -webkit-border-radius: 4px;
   background-color: hsla(213, 54%, 95%, 0);
 }
 
+.thumbnail-container:focus .thumbnail,
 .thumbnail-container:hover .thumbnail {
-  -webkit-animation: 'thumbnail-enter' 2.5s;
-  border-color: hsla(213, 66%, 57%, 1);
+  border-color: hsl(213, 66%, 57%);
   -webkit-box-shadow: 0px 2px 2px hsla(0, 0%, 0%, 0);
   -webkit-border-top-left-radius: 0;
   -webkit-border-top-right-radius: 0;
 
   background-image: -webkit-gradient(linear, left top, left bottom,
     from(hsla(0, 0%, 0%, 0)),
     color-stop(0.85, hsla(0, 0%, 47%, 0)),
     to(hsla(0, 0%, 47%, 0.2))
     );
+
+  /* delay border radius transition as much as the edit bar slide delay */
+  -webkit-transition-delay: 0, 0, 0, .5s, 0;
 }
 
+.thumbnail-container:focus > .edit-mode-border,
 .thumbnail-container:hover > .edit-mode-border {
-  -webkit-animation: 'edit-mode-border-enter' 2.5s;
-  background-color: hsla(213, 66%, 57%, 1);
+  background-color: hsl(213, 66%, 57%);
   -webkit-box-shadow: 0px 2px 2px hsla(0, 0%, 0%, .5);
 }
 
 .dragging {
   -webkit-transition: none;
 }
 
 .dragging > .title {
   opacity: 0 !important;
 }
@@ skipping 11 matching lines @@
   0% {
     opacity: 0;
   }
 
   100% {
     opacity: 1;
   }
 }
 
 .fade-in {
-  -webkit-animation: 'fade-in' 2.5s;
+  -webkit-animation: 'fade-in' .15s;
 }
 
 /* Notification */
 
 #notification {
   position: relative;
   background-color: hsl(52, 100%, 80%);
   -webkit-border-radius: 4px;
   padding: 8px 16px;
   white-space: nowrap;
@@ skipping 28 matching lines @@
 .list .thumbnail,
 .list .edit-bar {
   display: none;
 }
 
 .list > .thumbnail-container {
   -webkit-box-sizing: border-box;
 }
 
 .list > .thumbnail-container > .title {
-  font-size: 140%;
+  font-size: 160%;
   line-height: 40px;
   height: 40px;
   color: hsl(213, 27%, 68%);
-  text-decoration: underline;
   width: 100%;
 }
 
 .list .title > div {
   color: rgb(6, 45, 117);
 }
 
 .section {
   background: white;
   -webkit-border-radius: 4px;
@@ skipping 64 matching lines @@
 
 .window-menu {
   position: absolute;
   display: none;
   border: 1px solid #999;
   -webkit-box-shadow: 5px 5px 10px hsla(0, 0%, 0%, .3);
   background-color: hsla(213, 0%, 100%, .95);
   width: 157px;
   left: 0;
   white-space: nowrap;
-  z-index: 1;
+  z-index: 2;
   padding: 1px;
   cursor: default;
 }
 
 .hbox {
   display: -webkit-box;
   -webkit-box-orient: horizontal;
 }
 
 #recent-tabs,
@@ skipping 19 matching lines @@
   color: hsl(213, 27%, 68%);
 }
 
 .item.nav:after {
   content: '\00bb'; /* raque gets flipped automatically in rtl */
   font-size: 120%;
   -webkit-padding-start: 2px;
 }
 
 #recent-activities {
-  -webkit-transition: width .5s, opacity .5s;
+  -webkit-transition: width .15s, opacity .15s;
 }
 
 .section {
   -webkit-box-flex: 1;
   width: 50%;
   display: inline-block;
 }
 
 #view-toolbar {
   -webkit-user-select: none;
   text-align: right;
   position: relative;
   top: 35px;
 }
 
 html[dir='rtl'] #view-toolbar {
   text-align: left;
 }
 
 #view-toolbar > input {
   -webkit-appearance: none;
   background-color: transparent;
   width: 19px;
   height: 17px;
   margin: 0;
   border: 0;
   padding: 0;
   vertical-align: top;
   -webkit-margin-start: 5px;
+  /* Do not show focus outline */
+  outline: none;
 }
 
 #lower-sections {
   position: relative;
   overflow: hidden;
-  -webkit-transition: height .5s, width .5s, opacity .5s;
+  -webkit-transition: height .15s, width .15s, opacity .15s;
   white-space: nowrap;
 }
 
 #lower-sections > .section {
-  -webkit-transition: width .5s, opacity .5s, left .5s;
+  -webkit-transition: width .15s, opacity .15s, left .15s;
   -webkit-box-sizing: border-box;
   width: 460px; /* Set default size so we don't have to do a js layout at
                    load */
 }
 
 #lower-sections .spacer {
   width: 20px;
-  -webkit-transition: width .5s;
+  -webkit-transition: width .15s;
   display: inline-block;
 }
 
 #thumb-checkbox {
   background-image: url(chrome://theme/newtab_thumb_off);
 }
 
 #thumb-checkbox:hover {
   background-image: url(chrome://theme/newtab_thumb_off_h);
 }
@@ skipping 68 matching lines @@
   left: 0;
 }
 
 #option-menu > div {
   padding: 3px 8px;
   overflow: hidden;
   text-overflow: ellipsis;
 }
 
 #option-menu > [selected] {
-  background-color: hsla(213, 66%, 57%, 1);
+  background-color: hsl(213, 66%, 57%);
   color: white;
 }
 
 /* Hard code thumbnail positions to improve initial layout speed */
 #t0, #t4 {
   left: 0;
 }
 
 #t1, #t5 {
   left: 240px;
@@ skipping 58 matching lines @@
   }
 
   #t3, #t7 {
     left: 534px;
   }
 
   #t4, #t5, #t6, #t7 {
     top: 147px;
   }
 }