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In the new Markaby branch, I’ve got a list of valid tags and attributes generated from the XHTML 1.0 Transitional and XHTML 1.0 Strict DTDs. Which means Markaby can validate as you go.

 >> div :styl => 'margin:10px' do
 >> h1 "Never To Be Seen" 
 >> end
 Markaby::InvalidXhtmlError: no attribute `styl' on div elements
 >> salect :onclick => 'javascript:alert("GIMMICK!")' do
 >> option '- please -'
 >> end
 NoMethodError: no such method `salect'

However, there is no check right now to make sure that the nesting is right. It’ll let you put a tbody in a div, for example. But it’s a start.

The implicit stringification of tags and helpers is working fantastic now as well. Can ERB compete with this (from CampSh [103]):

 strong(author) + " worked on: " + 
 cmds.map { |cmd| 
 a cmd.name, :href => R(Show, cmd.name) }.join(", ")

There’s little need for the capture statement any longer. If you need to force a capture, call to_s on the HTML fragment.

 div { 
 @a = small('Miniature').to_s
 @b = strong('Large').to_s
 h1 "Monkeys" 
 h2 { "Giraffes #{@a} and #{@b}" }
 h3 "Donkeys" 
 h4 { "Parakeet #{@b} as well..." }
 }

It’s not needed in the above example, though, since the string interpolation will call to_s for you. Does that make sense?