mshtml: Added support for getElementsByTagName in document fragment nodes.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek at codeweavers.com>

Fixes regression from bug 39045.
---
 dlls/mshtml/htmldoc.c   | 46 +++++++++++++++++++++++++++++++++++----------
 dlls/mshtml/tests/dom.c | 50
+++++++++++++++++++++++++++++++++++--------------
 2 files changed, 72 insertions(+), 24 deletions(-)


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