Tex. R. App. P. 42.3

As amended through August 21, 2020
Rule 42.3 - Involuntary Dismissal in Civil Cases

Under the following circumstances, on any party's motion - or on its own initiative after giving ten days' notice to all parties - the appellate court may dismiss the appeal or affirm the appealed judgment or order. Dismissal or affirmance may occur if the appeal is subject to dismissal:

(a) for want of jurisdiction;
(b) for want of prosecution; or
(c) because the appellant has failed to comply with a requirement of these rules, a court order, or a notice from the clerk requiring a response or other action within a specified time.

Tex. R. App. P. 42.3