Let's see what would happen if a site or a web page is uploaded onto the web which has no title tags at all. Of course we have just mentioned two points here; the first case is a broad matter because a whole site is missing title tags while in the second case we are speaking about a single web page which has no titles. Certainly, as we will see later on, the first case could be worse and bring really bad results because a site might contain hundreds of pages and sometimes even more and assuming none of them having titles, well looks strange and terrible. Now, when a web page is saved online to a web hosting server via the file transferring programs or FTP applications, it will take some time before search engines crawlers notice the arrival and appearance of the new page. The time range might be between some hours to some days based on other factors like how the site linking structure has been enabled or activated or how the navigational menus connect establishments to the specified web page. Anyway, after a few days, the major search engine crawlers will begin visiting the page.
Now, you as the webmaster of the website expect to see your web page getting indexed as soon as possible, especially if you have spent some time preparing the page and have made it actually beautiful as well as informative. But after a rather long time, you still may not be able to see your web page indexed at any of the major search engines and so you start investigating the problematic matter which has caused the problem and indexing delay of your web page online and finally, you find out that you have forgotten adding a title tag to your page. Please note that search engines are made of some computer programs and they are not like people and human beings to notice some problems and then forgetting about them. On the contrary, if they approach a web page and see some basic important elements and items missing, they might completely forget about their crawling systems and may not even index the page. Of course the great news is that search engines have systems which will later on return to see if any editions have been made on the pages codes sections or not and if they find the pages in good shapes and having titles, they will crawl and index them easily.