Improve rustdoc css of "source" and "since" elements

src/librustdoc/html/render.rs

@@ -2144,7 +2144,7 @@ fn render_stability_since_raw<'a>(w: &mut fmt::Formatter,
                                   containing_ver: Option<&'a str>) -> fmt::Result {
     if let Some(v) = ver {
         if containing_ver != ver && v.len() > 0 {
-            write!(w, "<span class=\"since\">{}</span>",
+            write!(w, "<div class=\"since\">{}</div>",
                    v)?
         }
     }
@@ -2545,13 +2545,16 @@ fn render_impl(w: &mut fmt::Formatter, cx: &Context, i: &Impl, link: AssocItemLi
                render_header: bool, outer_version: Option<&str>) -> fmt::Result {
     if render_header {
         write!(w, "<h3 class='impl'><span class='in-band'><code>{}</code>", i.inner_impl())?;
-        let since = i.impl_item.stability.as_ref().map(|s| &s.since[..]);
-        render_stability_since_raw(w, since, outer_version)?;
         write!(w, "</span><span class='out-of-band'>")?;
+        let since = i.impl_item.stability.as_ref().map(|s| &s.since[..]);
         if let Some(l) = (Item { item: &i.impl_item, cx: cx }).href() {
+            write!(w, "<div class='ghost'></div>")?;
+            render_stability_since_raw(w, since, outer_version)?;
             write!(w, "<a id='src-{}' class='srclink' \
                        href='{}' title='{}'>[src]</a>",
                    i.impl_item.def_id.index.as_usize(), l, "goto source code")?;
+        } else {
+            render_stability_since_raw(w, since, outer_version)?;
         }
         write!(w, "</span>")?;
         write!(w, "</h3>\n")?;

src/librustdoc/html/static/rustdoc.css

@@ -97,6 +97,7 @@ h1, h2, h3:not(.impl):not(.method):not(.type):not(.tymethod), h4:not(.method):no
 h1.fqn {
     border-bottom: 1px dashed;
     margin-top: 0;
+    position: relative;
 }
 h2, h3:not(.impl):not(.method):not(.type):not(.tymethod), h4:not(.method):not(.type):not(.tymethod) {
     border-bottom: 1px solid;
@@ -105,6 +106,7 @@ h3.impl, h3.method, h4.method, h3.type, h4.type {
     font-weight: 600;
     margin-top: 10px;
     margin-bottom: 10px;
+    position: relative;
 }
 h3.impl, h3.method, h3.type {
     margin-top: 15px;
@@ -265,25 +267,39 @@ nav.sub {
 
 .content .out-of-band {
     font-size: 23px;
-    width: 40%;
     margin: 0px;
     padding: 0px;
     text-align: right;
     display: inline-block;
     font-weight: normal;
+    position: absolute;
+    right: 0;
 }
 
 h3.impl > .out-of-band {
     font-size: 21px;
 }
 
+h4 > code, h3 > code {
+    position: inherit;
+}
+
+.in-band, code {
+    z-index: 5;
+}
+
 .content .in-band {
-    width: 60%;
     margin: 0px;
     padding: 0px;
     display: inline-block;
 }
 
+#main { position: relative; }
+#main > .since {
+    top: inherit;
+    font-family: "Fira Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
+}
+
 .content table {
     border-spacing: 0 5px;
     border-collapse: separate;
@@ -503,11 +519,13 @@ em.stab p {
     opacity: 0.65;
 }
 
-span.since {
-    float: right;
+.since {
     font-weight: normal;
     font-size: initial;
     color: grey;
+    position: absolute;
+    right: 0;
+    top: 0;
 }
 
 .variants_table {
@@ -602,7 +620,19 @@ a.test-arrow {
     color: #999;
 }
 
+.ghost {
+    display: none;
+}
+
+.ghost + .since {
+    position: initial;
+    display: table-cell;
+}
 
+.since + .srclink {
+    display: table-cell;
+    padding-left: 10px;
+}
 
 /* Media Queries */
 

src/librustdoc/html/static/styles/main.css

@@ -26,6 +26,9 @@ h1.fqn {
 h2, h3:not(.impl):not(.method):not(.type):not(.tymethod), h4:not(.method):not(.type):not(.tymethod) {
     border-bottom-color: #DDDDDD;
 }
+.in-band, code {
+    background-color: white;
+}
 
 .docblock code {
     background-color: #F5F5F5;