Yes; most of the major browsers will recognize and accept the HTML keyword meta tag.
To the major search engines use the keyword meta tag?
Basically, no. Most of the major search engines simply ignore the HTML keyword meta tag or worse yet simply use it as a means to penalize your site, if they decide the keywords you chose to use do not closely enough relate to your content.
Are the HTML keyword meta tags worth putting a lot of work into?
Short answer, is no. If your intent is doing your keyword research is to create HTML keyword meta-tags, then you are basically wasting your time.
Then what is the value of keywords?
If you think of keyword research is identifying your focus words for your blog article, then there is value in doing keyword research. The value comes not from adding HTML keyword meta-tags, but rather through integrating your keywords ( focus words) into your blog article title, headers, and body content. These focus words can also be added to media metadata and used as part of your tactful repetition approach to content.
For all intents and purposes, HTML keyword meta-tags are useless from an HTML coding standpoint. However, doing keyword (focus words) research can be valuable in tuning the language of your blog article to optimize the focus of your blog post.