Fix strange font size boosting in mobile safari
Fix strange font size boosting in mobile safari

In certain scenarios mobile safari boosts the font size. The
web inspector shows the correct, inherited font size but the
actual font displays larger. Boosting is inconsistent. Font may
be sized correctly on load but then gets boosted upon orientation
change. In addition to that text within span elements within a
block may be sized correctly, even though the surrounding text
size is boosted up. `-webkit-text-size-adjust: 100%` seems to fix it.

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