http://downloads.dlang.org/releases/2.x/2.088.0/dmd.2.088.0.windows.7z see html/d/phobos/ core_simd.html for example compare it with online documentation https://dlang.org/phobos/core_simd.html maybe another almost empty files exists, but probably when u will fix this one u fix and others too
diff on page footer: online: Page generated by Ddoc on Fri Sep 27 10:10:54 2019 offline: Page generated by Ddoc on Sun Sep 1 19:48:51 2019 so, maybe next release will fix the issue
I checked offline documentation for 2.088.beta1 (win/zip, mac/lnx/tar) page core_simd.html was generated 3 oct and page is almost empty so question is: why online documentation is more fulfil than offline? please generate offline docs from same source as online