Issue on page /advanced/sphinx.html – unsynchronized tabs

[patrickmineault]

The synchronized tabs example doesn't work: the tabs aren't synced. The JS console console shows this:

Uncaught TypeError: sd_labels_by_text[syncId] is not iterable
    at HTMLLabelElement.onLabelClick (design-tabs.js:20:34)
onLabelClick @ design-tabs.js:20