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Fix accessibility of progressive enhancement pattern #177

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Fix accessibility of progressive enhancement pattern #177

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22 changes: 17 additions & 5 deletions src/lite-yt-embed.js
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Original file line number Diff line number Diff line change
Expand Up @@ -32,11 +32,18 @@ class LiteYTEmbed extends HTMLElement {

// Set up play button, and its visually hidden label
if (!playBtnEl) {
playBtnEl = document.createElement('button');
playBtnEl.type = 'button';
playBtnEl.classList.add('lty-playbtn');
playBtnEl = this.createPlayBtn();
this.append(playBtnEl);
}
// If the play button is a link, convert it to a button so it is interactive but doesn’t trigger a navigation.
if (playBtnEl.tagName === 'A') {
const isFocused = playBtnEl === document.activeElement;
const btnEl = this.createPlayBtn();
playBtnEl.replaceWith(btnEl);
// Preserve focus state if link is replaced with button.
if (isFocused) btnEl.focus();
playBtnEl = btnEl;
}
if (!playBtnEl.textContent) {
const playBtnLabelEl = document.createElement('span');
playBtnLabelEl.className = 'lyt-visually-hidden';
Expand All @@ -46,8 +53,6 @@ class LiteYTEmbed extends HTMLElement {

this.addNoscriptIframe();

playBtnEl.removeAttribute('href');

// On hover (or tap), warm up the TCP connections we're (likely) about to use.
this.addEventListener('pointerover', LiteYTEmbed.warmConnections, {once: true});

Expand Down Expand Up @@ -193,6 +198,13 @@ class LiteYTEmbed extends HTMLElement {
return iframeEl;
}

createPlayBtn(){
const btnEl = document.createElement('button');
btnEl.type = 'button';
btnEl.classList.add('lty-playbtn');
return btnEl;
}

/**
* In the spirit of the `lowsrc` attribute and progressive JPEGs, we'll upgrade the reliable
* poster image to a higher resolution one, if it's available.
Expand Down