Use of If in thinkphp HTML templates

When I wrote it was just a mistake, I struggled with {if} or <if Condition> in the manual, and of course I used the manual, but still didn't expand when I clicked the button (if the condition didn't follow).

Tried a lot of writing, also checked the logic, and various output, but the output is correct, such as the arrow pointing to the output, the result is correct

View thinkphp Manual If usage:

I have to pay attention to the details here, I just came out on this mistake. Look at the source code of my no execution results.

See the source code for proper execution:

Anyway the correct result is the switch effect of this space

Use of If in thinkphp HTML templates