<p></p>
<p dir="auto">Diary and other user provided content frequently includes rather large external images, which slows down page loading. We could force lazy loading of these assets by adding a loading="lazy" attribute to img tags, as described here: <a href="https://developer.mozilla.org/en-US/docs/Web/Performance/Lazy_loading" rel="nofollow">https://developer.mozilla.org/en-US/docs/Web/Performance/Lazy_loading</a></p>
<p dir="auto">The change is rather small, but I'm not sure if this doesn't cause unwanted side effects. Does anyone have any opinions on this topic?</p>
<div class="highlight highlight-source-ruby" dir="auto"><pre class="notranslate"><span class="pl-en">diff</span> --<span class="pl-en">git</span> <span class="pl-en">a</span>/<span class="pl-en">config</span>/<span class="pl-en">initializers</span>/<span class="pl-en">sanitize</span><span class="pl-kos">.</span><span class="pl-en">rb</span> <span class="pl-en">b</span>/<span class="pl-en">config</span>/<span class="pl-en">initializers</span>/<span class="pl-en">sanitize</span><span class="pl-kos">.</span><span class="pl-en">rb</span>
<span class="pl-en">index</span> <span class="pl-en">c9d6a5dbac</span>..<span class="pl-en">f8f2b784d9</span> <span class="pl-c1">100644</span>
--- <span class="pl-en">a</span>/<span class="pl-en">config</span>/<span class="pl-en">initializers</span>/<span class="pl-en">sanitize</span><span class="pl-kos">.</span><span class="pl-en">rb</span>
+++ <span class="pl-en">b</span>/<span class="pl-en">config</span>/<span class="pl-en">initializers</span>/<span class="pl-en">sanitize</span><span class="pl-kos">.</span><span class="pl-en">rb</span>
@@ -<span class="pl-c1">2</span><span class="pl-kos">,</span><span class="pl-c1">6</span> +<span class="pl-c1">2</span><span class="pl-kos">,</span><span class="pl-c1">10</span> @@ <span class="pl-v">Sanitize</span>::<span class="pl-v">Config</span>::<span class="pl-c1">OSM</span> <span class="pl-c1">=</span> <span class="pl-v">Sanitize</span>::<span class="pl-v">Config</span><span class="pl-kos">.</span><span class="pl-en">merge</span><span class="pl-kos">(</span>
<span class="pl-v">Sanitize</span>::<span class="pl-v">Config</span>::<span class="pl-c1">RELAXED</span><span class="pl-kos">,</span>
<span class="pl-pds">:elements</span> <span class="pl-c1">=></span> <span class="pl-v">Sanitize</span>::<span class="pl-v">Config</span>::<span class="pl-c1">RELAXED</span><span class="pl-kos">[</span><span class="pl-pds">:elements</span><span class="pl-kos">]</span> - <span class="pl-kos">%w[</span><span class="pl-s">div</span> <span class="pl-s">style</span><span class="pl-kos">]</span><span class="pl-kos">,</span>
<span class="pl-pds">:remove_contents</span> <span class="pl-c1">=></span> <span class="pl-kos">%w[</span><span class="pl-s">script</span> <span class="pl-s">style</span><span class="pl-kos">]</span><span class="pl-kos">,</span>
+ <span class="pl-pds">:attributes</span> <span class="pl-c1">=></span> <span class="pl-v">Sanitize</span>::<span class="pl-v">Config</span><span class="pl-kos">.</span><span class="pl-en">merge</span><span class="pl-kos">(</span>
+ <span class="pl-v">Sanitize</span>::<span class="pl-v">Config</span>::<span class="pl-c1">RELAXED</span><span class="pl-kos">[</span><span class="pl-pds">:attributes</span><span class="pl-kos">]</span><span class="pl-kos">,</span>
+ <span class="pl-s">"img"</span> <span class="pl-c1">=></span> <span class="pl-v">Sanitize</span>::<span class="pl-v">Config</span>::<span class="pl-c1">RELAXED</span><span class="pl-kos">[</span><span class="pl-pds">:attributes</span><span class="pl-kos">]</span><span class="pl-kos">[</span><span class="pl-s">"img"</span><span class="pl-kos">]</span> + <span class="pl-kos">[</span><span class="pl-s">"loading"</span><span class="pl-kos">]</span>
+ <span class="pl-kos">)</span><span class="pl-kos">,</span>
<span class="pl-pds">:transformers</span> <span class="pl-c1">=></span> <span class="pl-en">lambda</span><span class="pl-kos"></span> <span class="pl-k">do</span> |<span class="pl-s1">env</span>|
<span class="pl-s1">style</span> <span class="pl-c1">=</span> <span class="pl-s1">env</span><span class="pl-kos">[</span><span class="pl-pds">:node</span><span class="pl-kos">]</span><span class="pl-kos">[</span><span class="pl-s">"style"</span><span class="pl-kos">]</span> || <span class="pl-s">""</span>
@@ -<span class="pl-c1">24</span><span class="pl-kos">,</span><span class="pl-c1">5</span> +<span class="pl-c1">28</span><span class="pl-k"></span><span class="pl-kos">,</span><span class="pl-c1">7</span> @@ <span class="pl-v">Sanitize</span>::<span class="pl-v">Config</span>::<span class="pl-c1">OSM</span> <span class="pl-c1">=</span> <span class="pl-v">Sanitize</span>::<span class="pl-v">Config</span><span class="pl-kos">.</span><span class="pl-en">merge</span><span class="pl-kos">(</span>
<span class="pl-en">env</span><span class="pl-kos">[</span><span class="pl-pds">:node</span><span class="pl-kos">]</span><span class="pl-kos">[</span><span class="pl-s">"rel"</span><span class="pl-kos">]</span> <span class="pl-c1">=</span> <span class="pl-en">rel</span><span class="pl-kos">.</span><span class="pl-en">split</span><span class="pl-kos">.</span><span class="pl-en">select</span> <span class="pl-kos">{</span> |<span class="pl-s1">r</span>| <span class="pl-s1">r</span> == <span class="pl-s">"me"</span> <span class="pl-kos">}</span><span class="pl-kos">.</span><span class="pl-en">append</span><span class="pl-kos">(</span><span class="pl-s">"nofollow"</span><span class="pl-kos">,</span> <span class="pl-s">"noopener"</span><span class="pl-kos">,</span> <span class="pl-s">"noreferrer"</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">sort</span><span class="pl-kos">.</span><span class="pl-en">join</span><span class="pl-kos">(</span><span class="pl-s">" "</span><span class="pl-kos">)</span>
<span class="pl-en">end</span>
+
+ <span class="pl-en">env</span><span class="pl-kos">[</span><span class="pl-pds">:node</span><span class="pl-kos">]</span><span class="pl-kos">[</span><span class="pl-s">"loading"</span><span class="pl-kos">]</span> <span class="pl-c1">=</span> <span class="pl-s">"lazy"</span> <span class="pl-k">if</span> <span class="pl-en">env</span><span class="pl-kos">[</span><span class="pl-pds">:node_name</span><span class="pl-kos">]</span> == <span class="pl-s">"img"</span>
<span class="pl-k">end</span>
<span class="pl-kos">)</span></pre></div>
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