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curious george
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Instead of using a button I used a small text box that contains just a single space (so that the text box is never visible). The text box is hidden and then I use JavaScript to make it visible and as it shows it triggers an action(s) attached to it.

The text box has a CSS class added to it called “foo” (it doesn’t matter that the associated CSS doesn’t exist.)

The relevant js in the interaction looks like

var p = parent.window,
t = p.document.querySelector(“.foo”);

if (t && t.id && p[t.id + “actionShow”]) {

p[t.id + “actionShow”]();