How Do Conflicting `src` and Content Attributes in `` Tags Affect Browser Execution?

Question: Unraveling the Enigma of Script Tags with src and Content

Consider the following example from Google's 1 button:

<pre class="brush:php;toolbar:false"><script type="text/javascript" src="https://apis.google.com/js/plusone.js">
      {"parsetags": "explicit"}
</script>

This script tag possesses both a src attribute and content. What complexities does this combination introduce, and how does it affect browser execution?

Answer: Browser Divergence and Google's Solution

The coexistence of src and content in a script tag evokes divergent interpretations among browsers. Some browsers prioritize executing the content only if the src attribute resolves successfully, while others attempt to execute it regardless of the success of the src script's inclusion.

However, this behavior is unreliable and contradicts HTML5 specifications, rendering it a practice best avoided.

In this specific instance, Google does not depend on any particular browser behavior. The included content is merely an object literal, its execution triggering nothing more than a silent error.

Instead, Google's code parses the contents of the script tag itself, adapting its behavior accordingly. This allows them to mitigate browser inconsistencies while maintaining the desired functionality.

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