Next Spaceflight Countdown Userscript

Description

This userscript adds a countdown timer to elements on NextSpaceflight.com.

Functionality

• The script selects all elements with the class mdl-card.
• It searches for a span element inside each card where the id starts with "localized".
• If found, it attempts to parse the textContent of this element as a date.
• If the date is valid, the script calculates the time difference between the current time and the parsed date.
• The script looks for an element with the class csscolumns inside the card:
  • If found, it checks if an element with the class countdown-tag already exists.
  • If not, it creates a new div element with this class and appends it to the csscolumns container.
• The countdown timer is displayed in the format T-[days]d [hours]h [minutes]m [seconds]s and updates every second.

Execution

• The script runs immediately when the page is loaded.
• It updates the countdown every second using setTimeout to adjust for millisecond precision.

Page Matching

• The script runs on all pages under https://nextspaceflight.com/ as specified by @match.

Permissions

• The script does not request any special permissions (@grant none).

Notes

• If the required elements are not found or the parsed date is invalid, the script does nothing.