DatePicker prints "Empty string passed to getElementById" warning

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Bug Description

In Firefox (v118), DatePicker prints "Empty string passed to getElementById" warning twice in the console when I click to open it.

Affected Component

DatePicker

Expected Behaviour

Datepicker should not print any warnings to the console in regular usage.

Isolated Example

https://codesandbox.io/s/ui5-webcomponents-forked-jh4drz?file=/index.html

Steps to Reproduce

1. Use DatePicker like this: <ui5-date-picker value="2023-01-31"></ui5-date-picker> (+ the necessary JS imports)
2. In Firefox, click on the calendar icon to open the date picker popup
3. Two "Empty string passed to getElementById" warnings appear in the browser console, attributed to lines 425 and 426 in Popup.ts

Other browsers (Chrome, Safari) don't print these warnings.

If codesandbox does not work for you in Firefox, you can also reproduce this behaviour on this page for example (again, only in Firefox): https://sap.github.io/ui5-webcomponents/playground/?path=/docs/main-datepicker--docs

Log Output, Stack Trace or Screenshots

Priority

None

UI5 Web Components Version

1.18.0

Browser

Firefox

Operating System

MacOS

Additional Context

• getElementById should not be called with an empty string
• Noise in the console makes it harder to see legitimate problems.

Organization

No response

Declaration

• [X] I’m not disclosing any internal or sensitive information.

[yanaminkova]

Hello @SAP/ui5-webcomponents-topic-b,

In the following codesandbox example, each time you click on the calendar icon, two "Empty string passed to getElementById" warnings appear in the browser console. This behaviour is reproducible only in FireFox browser.

Could you please have a look at it?

Kind regards, Yana

[unazko]

Hello @SAP/ui5-webcomponents-topic-rd,

Those warnings appear in the popover basic storybook sample as well: https://sap.github.io/ui5-webcomponents/playground/?path=/docs/main-popover--docs

There are related to the focus initial focus placement although there is no focusing issue in the samples. Could you please provide your feedback.

Best regards, Boyan