Add ability to dismiss alt text badge by tapping it in web UI

app/javascript/hooks/useSelectableClick.ts

@@ -0,0 +1,55 @@
+import { useRef, useCallback } from 'react';
+
+type Position = [number, number];
+
+export const useSelectableClick = (
+  onClick: React.MouseEventHandler,
+  maxDelta = 5,
+) => {
+  const clickPositionRef = useRef<Position | null>(null);
+
+  const handleMouseDown = useCallback((e: React.MouseEvent) => {
+    clickPositionRef.current = [e.clientX, e.clientY];
+  }, []);
+
+  const handleMouseUp = useCallback(
+    (e: React.MouseEvent) => {
+      if (!clickPositionRef.current) {
+        return;
+      }
+
+      const [startX, startY] = clickPositionRef.current;
+      const [deltaX, deltaY] = [
+        Math.abs(e.clientX - startX),
+        Math.abs(e.clientY - startY),
+      ];
+
+      let element: EventTarget | null = e.target;
+
+      while (element && element instanceof HTMLElement) {
+        if (
+          element.localName === 'button' ||
+          element.localName === 'a' ||
+          element.localName === 'label'
+        ) {
+          return;
+        }
+
+        element = element.parentNode;
+      }
+
+      if (
+        deltaX + deltaY < maxDelta &&
+        (e.button === 0 || e.button === 1) &&
+        e.detail >= 1
+      ) {
+        onClick(e);
+      }
+
+      clickPositionRef.current = null;
+    },
+    [maxDelta, onClick],
+  );
+
+  return [handleMouseDown, handleMouseUp] as const;
+};

app/javascript/mastodon/components/alt_text_badge.tsx

@@ -1,4 +1,4 @@
-import { useState, useCallback, useRef } from 'react';
+import { useState, useCallback, useRef, useId } from 'react';
 
 import { FormattedMessage } from 'react-intl';
 
@@ -8,12 +8,15 @@ import type {
   UsePopperOptions,
 } from 'react-overlays/esm/usePopper';
 
+import { useSelectableClick } from '@/hooks/useSelectableClick';
+
 const offset = [0, 4] as OffsetValue;
 const popperConfig = { strategy: 'fixed' } as UsePopperOptions;
 
 export const AltTextBadge: React.FC<{
   description: string;
 }> = ({ description }) => {
+  const accessibilityId = useId();
   const anchorRef = useRef<HTMLButtonElement>(null);
   const [open, setOpen] = useState(false);
 
@@ -25,12 +28,16 @@ export const AltTextBadge: React.FC<{
     setOpen(false);
   }, [setOpen]);
 
+  const [handleMouseDown, handleMouseUp] = useSelectableClick(handleClose);
+
   return (
     <>
       <button
         ref={anchorRef}
         className='media-gallery__alt__label'
         onClick={handleClick}
+        aria-expanded={open}
+        aria-controls={accessibilityId}
       >
         ALT
       </button>
@@ -47,9 +54,12 @@ export const AltTextBadge: React.FC<{
       >
         {({ props }) => (
           <div {...props} className='hover-card-controller'>
-            <div
+            <div // eslint-disable-line jsx-a11y/no-noninteractive-element-interactions
               className='media-gallery__alt__popover dropdown-animation'
               role='tooltip'
+              id={accessibilityId}
+              onMouseDown={handleMouseDown}
+              onMouseUp={handleMouseUp}
             >
               <h4>
                 <FormattedMessage

app/javascript/mastodon/features/account/components/domain_pill.tsx

@@ -1,4 +1,4 @@
-import { useState, useRef, useCallback } from 'react';
+import { useState, useRef, useCallback, useId } from 'react';
 
 import { FormattedMessage } from 'react-intl';
 
@@ -16,6 +16,7 @@ export const DomainPill: React.FC<{
   username: string;
   isSelf: boolean;
 }> = ({ domain, username, isSelf }) => {
+  const accessibilityId = useId();
   const [open, setOpen] = useState(false);
   const [expanded, setExpanded] = useState(false);
   const triggerRef = useRef(null);
@@ -34,6 +35,8 @@ export const DomainPill: React.FC<{
         className={classNames('account__domain-pill', { active: open })}
         ref={triggerRef}
         onClick={handleClick}
+        aria-expanded={open}
+        aria-controls={accessibilityId}
       >
         {domain}
       </button>
@@ -48,6 +51,8 @@ export const DomainPill: React.FC<{
         {({ props }) => (
           <div
             {...props}
+            role='tooltip'
+            id={accessibilityId}
             className='account__domain-pill__popout dropdown-animation'
           >
             <div className='account__domain-pill__popout__header'>

app/javascript/mastodon/features/alt_text_modal/components/info_button.tsx

@@ -6,6 +6,7 @@ import classNames from 'classnames';
 
 import Overlay from 'react-overlays/Overlay';
 
+import { useSelectableClick } from '@/hooks/useSelectableClick';
 import QuestionMarkIcon from '@/material-icons/400-24px/question_mark.svg?react';
 import { Icon } from 'mastodon/components/icon';
 
@@ -23,6 +24,8 @@ export const InfoButton: React.FC = () => {
     setOpen(!open);
   }, [open, setOpen]);
 
+  const [handleMouseDown, handleMouseUp] = useSelectableClick(handleClick);
+
   return (
     <>
       <button
@@ -46,10 +49,13 @@ export const InfoButton: React.FC = () => {
         target={triggerRef}
       >
         {({ props }) => (
-          <div
+          <div // eslint-disable-line jsx-a11y/no-noninteractive-element-interactions
             {...props}
             className='dialog-modal__popout prose dropdown-animation'
+            role='tooltip'
             id={accessibilityId}
+            onMouseDown={handleMouseDown}
+            onMouseUp={handleMouseUp}
           >
             <FormattedMessage
               id='info_button.what_is_alt_text'