Perhaps just querying the cr-dialog's DOM for the "action-button" CSS class could be a way to find the default button. Then we could query whether this button is enabled and if enabled, simulate a click/tap on it.

A different approach I had thought initially here, for discussion (perhaps more
complicated than previous one).

We could add two new methods to cr-dialog, canSubmit() and submit(). The default implementations will be

canSubmit: function() { return false; }
submit: function() { // no-op; }

Users of cr-dialog are not subclasses, just instances of <cr-dialog> itself, so in order to override those methods they would need to do something as follows.

myDialog.canSubmit = function() { /* validation logic here */ };
myDialog.submit = function() { /* perform submit action here */ };

When an 'Enter' key is detected, the cr-dialog would simply do
if (this.canSubmit() && !this.forbiddenTagnames.has(e.target.tagName))
  this.submit();

where forbiddenTagnames is similar to the link posted by @tommycli above.

Finally that entire functionality would be opt-in as follows
<dialog is="cr-dialog" submit-on-enter>...</dialog>

^ Great thoughts.

this might help guide someone on this quest:
https://cs.chromium.org/chromium/src/ui/webui/resources/js/cr/ui/overlay.js?q=ui/webui/resources/js/cr/ui/overlay.js&sq=package:chromium&dr&l=60

tommycli@: how many dialogs in md-settings currently don't have good default Enter handling?

They should all have Enter handlers now. They're just all implemented per-instance.

ah, nvm then

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

@tommy: Is this bug a duplicate of issue 626420? Can we dedup? If not, is there anything left to do here?

Agreed thanks.