So the code here:

It contains the values:

• writing-mode: bt-lr; which Chrome declares as invalid property value
• -webkit-appearance: slider-vertical; to which it logs an error that the value will be removed in the future

Error message is
The keyword 'slider-vertical' specified to an 'appearance' property is not standardized. It will be removed in the future. Use <input type=range style="writing-mode: vertical-lr; direction: rtl"> instead.

Firefox calls both values invalid, but somehow works even if you disable them from dev tools.

More here : https://developer.mozilla.org/en-US/docs/Web/CSS/appearance