How to make a href link in button short code works with a fixed sized popup window

Dear BlueOwl,
Here is the button shortcade, it will open the link in a new tab.
[button href="example.html" target="_blank" css_classes="e.g. button_hilite button_pale sm_button"]Datasheet[/button]

what if i want to open the link in a fixed sized popup window? I tried the code below, it doesn’t work.
[button href="example.html" target="popup" onclick="window.open('example.html', 'popup', 'width=300,height=150'); return false" css_classes="e.g. button_hilite button_pale sm_button"]Datasheet[/button]

Can you help me how to make it work?

Thank you so much!