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registered_meta_key_exists(): Checks if a meta key is registered.
register_activation_hook(): Set the activation hook for a plugin.
register_block_script_handle(): Finds a script handle for the selected block metadata field.
register_block_script_module_id(): Finds a script module ID for the selected block metadata field.
register_block_style(): Registers a new block style.
register_block_style_handle(): Finds a style handle for the block metadata field.
register_block_template(): Register a block template.
register_block_type(): Registers a block type.
register_block_type_from_metadata(): Registers a block type from the metadata stored in the block.json file.
register_deactivation_hook(): Sets the deactivation hook for a plugin.
register_meta(): Registers a meta key.
register_post_meta(): Registers a meta key for posts.
register_post_status(): Registers a post status.
register_post_type(): Registers a post type.
register_rest_field(): Registers a new field on an existing WordPress object type.
register_rest_route(): Registers a REST API route.
register_setting(): Registers a setting and its data.
register_shutdown_function() — Register a function for execution on shutdown.
register_sidebar(): Builds the definition for a single sidebar and returns the ID.
register_sidebars(): Creates multiple sidebars.
register_taxonomy(): Creates or modifies a taxonomy object.
register_term_meta(): Registers a meta key for terms.
register_theme_feature(): Registers a theme feature for use in add_theme_support().
register_uninstall_hook(): Sets the uninstallation hook for a plugin.
A registrable domain is a domain that can be (or has already been) registered by an individual or an organization through a domain name registrar.
A regression test checks that previously expected behavior still works after a change.
Regular expressions (or regex) are rules that govern which sequences of characters come up in a search.
A release checklist identifies the concrete conditions required before distributing a build, such as version consistency, installable packaging, relevant tests, and release notes.
A relying party (RP) is an entity that needs to control access to a resource and, to do so, needs to authenticate other entities that are trying to access that resource.
remove_accents(): Converts all accent characters to ASCII characters.
remove_action(): Removes a callback function from an action hook.
remove_filter(): Removes a callback function from a filter hook.
remove_query_arg(): Removes an item or items from a query string.
remove_theme_support(): Allows a theme to de-register its support of a certain feature Should be called in the theme's functions.php file.
Render-blocking refers to any part of the process of loading a website that blocks the rendering of the user interface.
render_block(): Renders a single block into a HTML string.
Repaint happens when a browser redraws a web page to show the visual updates resulting from a UI change, such as after an update on an interactive site.
The following are treated as replaced elements only in specific cases:
In web security, a replay attack happens when an attacker intercepts a previously-sent message and resends it later to get the same credentials as the original message, potentially with a different payload or instruction.
A representation header (or 'representation metadata') is an HTTP header that describes how to interpret the data contained in the message.
Reproduction steps describe the exact sequence that triggers a reported problem, along with the starting conditions and expected result.
The Request() constructor creates a new Request object.
The arrayBuffer() method of the Request interface reads the request body and returns it as a promise that resolves with an ArrayBuffer.
The formData() method of the Request interface reads the request body and returns it as a promise that resolves with a FormData object.
The json() method of the Request interface reads the request body and returns it as a promise that resolves with the result of parsing the body text as JSON.
Combining concurrent requests for the same result into one shared in-flight operation.
A request header is an HTTP header that can be used in an HTTP request to provide information about the request context, so that the server can tailor the response.
require_if_theme_supports(): Checks a theme's support for a given feature before loading the functions which implement it.
The resize CSS property sets whether an element is resizable, and if so, in which directions.
The ResizeObserver constructor creates a new ResizeObserver object, which can be used to report changes to the content or border box of an Element or the bounding box of an SVGElement.