A capturing group groups a subpattern, allowing you to apply a quantifier to the entire group or use disjunctions within it. It memorizes information about the subpattern match, so that you can refer back to it later with a backreference, or access the information through the match results.

The JavaScript exception "missing formal parameter" occurs when your function declaration is missing valid parameters.

The requiredFeatures attribute takes a list of feature strings, with the individual strings separated by white space. It determines whether or not all of the named features are supported by the browser; if all of them are supported, the attribute evaluates to true end the element is rendered; otherwise, the attribute evaluates to false and the current element and its children are skipped and thus will not be rendered. This provides a way to design SVG that gracefully falls back when features aren't available.

The JavaScript exception "identifier starts immediately after numeric literal" occurs when an identifier started with a digit. Identifiers can only start with a letter, underscore (_), or dollar sign ($).

The static keyword defines a static method or field for a class, or a static initialization block (see the link for more information about this usage). Static properties cannot be directly accessed on instances of the class. Instead, they're accessed on the class itself.

The JavaScript exception "a declaration in the head of a for-of loop can't have an initializer" occurs when the head of a for...of loop contains an initializer expression such as for (const i = 0 of iterable). This is not allowed in for-of loops.

The stroke-linejoin attribute is a presentation attribute defining the shape to be used at the corners of paths when they are stroked.

The JavaScript strict mode-only exception "applying the 'delete' operator to an unqualified name is deprecated" occurs when variables are attempted to be deleted using the delete operator.

package Unicode::Collate::CJK::Zhuyin; use 5.006; use strict; use warnings; our $VERSION = '1.31'; my %u2p; my $wt = 0x8000; while (<DATA>) { last if /^__END__/; my @c = split; for my $c (@c) { nex...

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