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- PDF/X-1a, PDF/X-3 and PDF 1.3 files leave the layers they don't print out of the flattening. A flattened group no longer takes the place of art in a layer that doesn't print, so the art of a clipping layer over such a layer prints, and art of a layer that doesn't print stays out of the file. - A flattened group goes into a lower layer only when that layer prints, shows and is a template as the clipping layer does, the clipping layer and the groups it leaves have no opacity, blend mode or isolation, and the clipping path has no fill. Otherwise the group holds only the art inside the clipping layer, drawn over the clipping path's fill and the art below, and the art below is flattened on its own. Before, the fill covered the group, the group lost the layer's opacity, or the clipping path cut the art below. - Transparent art that a clipping path hides entirely, such as one of area type holding only a space, is removed. Before, the export failed because the art kept its transparency. Object › Flatten Transparency follows the same rules. Documents without clipping layers or layers that don't print export the same bytes as before.