features: Use CSS to properly normalize image sizes (#486)

On the features page, the logos have all different sizes. The height is
manually set to 32px, but some other CSS overrides that with `height:
auto`:

<img width="457" height="237" alt="CleanShot 2025-10-30 at 08 21 59@2x"
src="https://github.com/user-attachments/assets/85333943-fb80-457e-bf78-efea97b7b234"
/>

This PR adds CSS to constrain the height of the logos via `max-height`.

Author: pdubroy

css/custom.css

@@ -2585,6 +2585,10 @@ pre code::after {
   background: rgba(0, 0, 0, 0.04);
 }
 
+#feature-support th img {
+  max-height: 32px;
+}
+
 .feature-cell {
   position: relative;
   height: 24px; /* height of the icon inside */

features.js

@@ -57,8 +57,8 @@
         ...Object.entries(browsers).map(([name, { url, logo }]) =>
           h('th', { scope: 'col', id: idMap['table-col'](name) }, [
             h('a', { href: url, target: '_blank' }, [
-              // https://www.w3.org/WAI/WCAG22/Techniques/html/H2
-              h('img', { src: logo, height: 32, alt: '' }),
+              // Empty alt trick: https://www.w3.org/WAI/WCAG22/Techniques/html/H2
+              h('img', { src: logo, alt: '' }),
               h('br'),
               name,
             ]),