Hot answers tagged transparency
To do this I would take a copy of the layer, and then set complementary Definition Queries on the two layers so that you can set transparency on the features appearing in one layer while leaving those in the other layer opaque.
The easiest way to do this is by using layer styles. Just set the transparency of a single layer to 27% and copy/paste the style to all other layers. You can paste a style to multiple layers at once. See also: http://hub.qgis.org/issues/14931
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