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Don't serve Safari XHTML because of a bug in <picture> elements causing multiple images to be downloaded

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This commit is contained in:
Alex Cabal 2022-09-26 20:18:04 -05:00
parent f1352ec215
commit 733b52c581
5 changed files with 16 additions and 9 deletions
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18
templates/Header.php
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@ -5,15 +5,23 @@ $highlight = $highlight ?? '';
$description = $description ?? '';
$manual = $manual ?? false;
$colorScheme = $_COOKIE['color-scheme'] ?? 'auto';
$xmlDeclaration = $xmlDeclaration ?? true;
$isXslt = $isXslt ?? false;
$feedUrl = $feedUrl ?? null;
$feedTitle = $feedTitle ?? '';
$is404 = $is404 ?? false;
if($xmlDeclaration){
header('content-type: application/xhtml+xml; charset=utf-8');
print('<?xml version="1.0" encoding="utf-8"?>');
print("\n");
// As of Sep 2022, all versions of Safari have a bug where if the page is served as XHTML,
// then <picture> elements download all <source>s instead of the first supported match.
// So, we try to detect Safari here, and don't use multiple <source> if we find Safari.
// See https://bugs.webkit.org/show_bug.cgi?id=245411
$isSafari = stripos($_SERVER['HTTP_USER_AGENT'] ?? '', 'safari') !== false;
if(!$isXslt){
if(!$isSafari){
header('content-type: application/xhtml+xml; charset=utf-8');
print('<?xml version="1.0" encoding="utf-8"?>');
print("\n");
}
print("<!DOCTYPE html>\n");
}
?>