Browsers may show the native tooltips from the HTML title attribute and SVG <title> on focus (and not only on hover). Most do not, though IIRC IE and/or Edge do/did. I've filed the following MDN Browser Compat Data issues:

• svg.elements.title - Tooltip display on focus mdn/browser-compat-data#16831
• html.global_attributes.title - Tooltip display on focus mdn/browser-compat-data#16832

The following bugs may be relevant to both HTML title and SVG <title> (that's certainly the case for the Chromium bug):

• https://bugs.chromium.org/p/chromium/issues/detail?id=829352
• https://bugzilla.mozilla.org/show_bug.cgi?id=97223
• https://bugs.webkit.org/show_bug.cgi?id=61732

Perhaps it's not necessary from a support data POV to file an issue here too, but some people might be interested, and find this useful?