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How do I add the "onload" attribute to a script tag?

I need to add the onload event in jquery script tag as advagg does. I have done a bit of research, and I found that they are actually invoking hook_element_info_alter() and thereby add their hook_advagg_modify_js_pre_render() implementation into it. Then, they alter the child elements.

When I do the same in a hook_element_info_alter() implementation, type['script'] is not there.

Am I missing something?

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How do I add the "onload" attribute to a script tag?

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