I'm actually saving a page. It'll create a folder and a 'htm' file. The folder and the htm file has the same name with the folder having '_files' suffix.
Well, After your post, I did some more testing and it turns out that it's actually a bug within Chrome cause the temp file remaining in the 'Downloads' folder is actually that 'htm' file that Chrome should rename (but for some reason it won't)... I save lots of save pages when I'm surfing the net so I went to open some of them and interestingly enough, some of them didn't have their specific 'htm' file (the folder was there though) those tmp files I took a pic from were actually the htm files.
After this I did some more testing. I placed the default downloads folder and chrome side to side and saved a page, suddenly lots of '.tmp' files created in downloads folder and then all of them were disappeared in the blink of an eye. When I check the saved page, both 'htm' file and its specific folder was at the correct place (D:\Downloads <-- it's the location I've configured Chrome to save it's downloads) Then I did it again and this time one of the files remained in the default downloads folder (C:\Users\
USERNAME\Downloads) and when I checked the saved page in 'D:\Downloads', the htm was missing. I renamed the remaining .tmp file to match the folder and gave it a .htm extension and when I opened it, it was the correct page.
I also configured Chrome to use the default downloads location and did some testing to see if it's because of the different location of downloads, but this phenomenon occurred again, so it's not because of the different location.
Thank god I didn't delete those temp files.
EDIT
Damn, now I remember, I have deleted some of those temp files (around 20 of them) before in the last month. Dammit, Chrome.