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Normally, rules in your form are not executed in read-only mode. There is one exception: form.load rules will still execute as expected. Any rules that get triggered due to form.load output will also be executed. For instance, you can have a rule executed on form load that will select a tab named Review, of a tab control based on input from a name field. The rule below results in the Review Tab being selected if the name is Jack Smith:
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Appending the _readonly=true parameter to your forms Raw Link, will display the form but not allow input. Rules using the identifier form.load and any other rules that get triggered will be executed in Read Only mode. The result is shown in the image: