I know that it is allowed in SEO to use comma as separator but, is it ok to add comma as a separator between keywords in title
without leaving a space?
Example:
<title>High blood pressure,Hypertension</title>
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Sign up to join this communityYou may use any sign as separator, but you should always keep the readability in view. Suffering readability will for sure suffer your SERP CTR - and this would be too bad, to get an impression but to loose the click.
Google will recognize your keywords anyway - it will do it based on words placed befor and after words, which are weirdly separated, like in your example. Compare SERPs on these three searches:
They are the same - ergo Google recognizes them all. But seeing such in the page title would not necessarily motivate to clik it.
In Google, you use three things to separate data in the search engine.
High blood pressure (hypertension)
, Bupa UK usesHigh blood pressure | Healthcare | Bupa UK
. Google is smart enough to link words, so even if the user forgets to type hypertension Google will fill in the blanks, assuming its in the meta description.,
is a good word separator assuming its has a space after it, giving you some distance between words, without it is weak... this applies to all symbols that help separate word e.gGood Health (Guide)
Bad Health(Guide)
.