In Twig, the {% extends %} tag is used to inherit and extend the contents of another template. In the case you provided: {% extends "filed--text.html.twig" %}This means that the current template is extending the content of the template file named "filed--text.html.twig." The contents of the extended template will be used as a base, and the current template can override or add to specific blocks defined in the base template.   A breakdown of the elements {% extends "filed--text.html.twig" %}...

Update Drupal to 10.1.x and I'm receiving the following error Twig\Error\SyntaxError: Unexpected "spaceless" tag (expecting closing tag for the "macro" tag defined near line 2). in Twig\Parser->subparse() (line 2 of themes/custom/{theme}/templates/misc/filesize-macro.html.twig).The error message clearly indicates that there's a problem in the Twig template file at line 2. Specifically, there is an "Unexpected 'spaceless' tag" and it's expecting a closing tag for the "macro" tag that was...