Bug 1470199 implemented the observed attribute for @default-value but didn't do anything with it so it's dead code. This regressed the previous behaviour where .defaultValue was set on the plain <input>. When a card is added from the dialog, the CSC/CVV is no longer also populated on the summary page. STR: 1) Add a card from the dialog; include the CVV/CSC (either in the FTU or not) 2) Click Save/Next to return to the summary page Expected result: CSC/CVV field on the summary page has the value just entered on the add page Actual result: CSC/CVV field is blank I think the main fix is: render() { + this._input.defaultValue = this.defaultValue || ""; if (this.value) { but I think the @value handling should be reviewed and a test will be needed.

Pushed by jwein@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/bcf4e23132eb Render the defaultValue in the CSC input if one has been provided. r=MattN

CSC/CVV field on the summary page has the value entered on the "Add Credit Card" page on Firefox Nightly 65.0a1 (2018-11-14) on Windows 10 x 64, Windows 7 x32, Mac OS X 10.13 and on Ubuntu 16.04 x64. But shouldn't the CVV be reset after selecting another payment method from the drop down?

(In reply to Hani Yacoub from comment #4) > But shouldn't the CVV be reset after selecting another payment method from > the drop down? The plan is to select (highlight) the CVV text so that the user can type over it if they want but it's possible they typed the correct CVV before using the picker so we don't want to clear it automatically. We have bug 1472712 on file for that already.

Got it! Thanks.