When the user types Command,+ or Command,- the font size should change, along with the size of the disclosure triangles.
<rdar://problem/21752338>
*** Bug 147408 has been marked as a duplicate of this bug. ***
Reopened because this was never resolved and it came up again in review for bug 267311.
In addition to the requested keyboard combo, an "Aa" control would be another way to potential solve this.
Aforementioned PR review where this came up. https://github.com/WebKit/WebKit/pull/22633
Seems like this one has been resolved via another fix since the time it was requested... Cmd +/- works for me as long as focus is in the Inspector.