fix: improve accessibility of copy button in README component

Author: imrofayel

app/components/Readme.vue

@@ -137,8 +137,7 @@ const handleCopy = async (e: MouseEvent) => {
 .readme :deep(.readme-copy-button) {
   position: absolute;
   top: 0.4rem;
-  right: 0.4rem;
-  left: auto;
+  inset-inline-end: 0.4rem;
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -154,7 +153,8 @@ const handleCopy = async (e: MouseEvent) => {
     border-color 0.2s ease;
 }
 
-.readme :deep(.readme-code-block:hover .readme-copy-button) {
+.readme :deep(.readme-code-block:hover .readme-copy-button),
+.readme :deep(.readme-copy-button:focus-visible) {
   opacity: 1;
 }
 
@@ -179,8 +179,7 @@ const handleCopy = async (e: MouseEvent) => {
 .readme :deep(.readme-copy-button) {
   position: absolute;
   top: 0.4rem;
-  right: 0.4rem;
-  left: auto;
+  inset-inline-end: 0.4rem;
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -196,7 +195,8 @@ const handleCopy = async (e: MouseEvent) => {
     border-color 0.2s ease;
 }
 
-.readme :deep(.readme-code-block:hover .readme-copy-button) {
+.readme :deep(.readme-code-block:hover .readme-copy-button),
+.readme :deep(.readme-copy-button:focus-visible) {
   opacity: 1;
 }
 
@@ -421,4 +421,17 @@ const handleCopy = async (e: MouseEvent) => {
   margin: 0 0.25rem 0.25rem 0;
   border-radius: 4px;
 }
+
+/* Screen reader only text */
+.readme :deep(.sr-only) {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border-width: 0;
+}
 </style>

server/utils/readme.ts

@@ -310,9 +310,10 @@ export async function renderReadmeHtml(
   renderer.code = ({ text, lang }: Tokens.Code) => {
     const html = highlightCodeSync(shiki, text, lang || 'text')
     // Add copy button
-    return `<div class="readme-code-block" dir="ltr">
-<button type="button" class="readme-copy-button" title="Copy code" check-icon="i-carbon:checkmark" copy-icon="i-carbon:copy" data-copy>
+    return `<div class="readme-code-block" >
+<button type="button" class="readme-copy-button" aria-label="Copy code" check-icon="i-carbon:checkmark" copy-icon="i-carbon:copy" data-copy>
 <span class="i-carbon:copy" aria-hidden="true"></span>
+<span class="sr-only">Copy code</span>
 </button>
 ${html}
 </div>`