Hi Team, Wile going through Blink's commit, I came across another potential one but I am not sure, whether it will have an impact since we don't have MHTML but we seems have to have FIXME: Blink Commit - https://chromium.googlesource.com/chromium/src.git/+/f7030ffe17ea03cf8a2e9189d7d764dfd07da26a WebKit Source FIXME - https://searchfox.org/wubkat/source/Source/WebCore/page/PageSerializer.cpp#267 We don't have appendLiteral, so following needs to be added after Line 242: cssText.append("@charset \""); cssText.append(styleSheet->contents().charset().convertToASCIILowercase()); cssText.append("\";\n\n"); ___ Don't know equivalent of lower() from blink commit but I think it would be 'convertToASCIILowercase()'. Just wanted to raise a get input whether to merge it or get rid of "FIXME". Don't have testcase as well. :-( Thanks!