alt attribute on img tag is missing

[reiz]

The alt attribute on img tags is always missing. I have expected to set the alt attribute by adding a caption (figcaption). But that's not happening. Especially for SEO optimised sites the alt attribute is very important. How can I set it? Anny help is appreciated!

[reiz]

Currently I'm solving it like this:

<% xml = Nokogiri::HTML5.fragment blog.content %>
<% xml.xpath(".//img").each do |img| %>
    <% figcaption = img.parent.xpath("figcaption").first %>
    <% next if figcaption.nil? || figcaption.text.to_s.strip.empty? %>
    <% img.set_attribute("alt", figcaption.text.to_s.strip) %>
<% end %>
<%= xml.to_s.html_safe %>