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<title>[39297] trunk/src/wp-content/themes/twentyseventeen: Twenty Seventeen: Adds `background-attachment: fixed;` to devices that should support it</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/39297">39297</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/39297","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>davidakennedy</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2016-11-18 20:10:18 +0000 (Fri, 18 Nov 2016)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Twenty Seventeen: Adds `background-attachment: fixed;` to devices that should support it
iOS disables this feature under the hood, but it also distorts the images ?\226?\128?\147 unlike other mobile devices that don't support it. So this adds a check for both `background-attachment: fixed` support or whether it?\226?\128?\153s an iOS device - passing it adds the class `background-fixed` which is used to add the proper styles.
It also lowers the media query so the parallax-like style is present on a wider range of screens since this bug can be better targeted and avoided. In this way, screens that aren't the offending devices aren't punished merely based on screen size.
Props joemcgill, laurelfulford, helen.
Fixes <a href="https://core.trac.wordpress.org/ticket/38395">#38395</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpcontentthemestwentyseventeenassetsjsglobaljs">trunk/src/wp-content/themes/twentyseventeen/assets/js/global.js</a></li>
<li><a href="#trunksrcwpcontentthemestwentyseventeenstylecss">trunk/src/wp-content/themes/twentyseventeen/style.css</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpcontentthemestwentyseventeenassetsjsglobaljs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-content/themes/twentyseventeen/assets/js/global.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-content/themes/twentyseventeen/assets/js/global.js 2016-11-18 19:32:03 UTC (rev 39296)
+++ trunk/src/wp-content/themes/twentyseventeen/assets/js/global.js 2016-11-18 20:10:18 UTC (rev 39297)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -148,6 +148,34 @@
</span><span class="cx" style="display: block; padding: 0 10px"> return 'http://www.w3.org/2000/svg' === ( 'undefined' !== typeof SVGRect && div.firstChild && div.firstChild.namespaceURI );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+ * Test if an iOS device.
+ */
+ function checkiOS() {
+ return /iPad|iPhone|iPod/.test(navigator.userAgent) && ! window.MSStream;
+ }
+
+ /*
+ * Test if background-attachment: fixed is supported.
+ * @link http://stackoverflow.com/questions/14115080/detect-support-for-background-attachment-fixed
+ */
+ function supportsFixedBackground() {
+ var el = document.createElement('div'),
+ isSupported;
+
+ try {
+ if ( ! ( 'backgroundAttachment' in el.style ) || checkiOS() ) {
+ return false;
+ }
+ el.style.backgroundAttachment = 'fixed';
+ isSupported = ( 'fixed' === el.style.backgroundAttachment );
+ return isSupported;
+ }
+ catch (e) {
+ return false;
+ }
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> // Fire on document ready.
</span><span class="cx" style="display: block; padding: 0 10px"> $( document ).ready( function() {
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -184,6 +212,10 @@
</span><span class="cx" style="display: block; padding: 0 10px"> if ( true === supportsInlineSVG() ) {
</span><span class="cx" style="display: block; padding: 0 10px"> document.documentElement.className = document.documentElement.className.replace( /(\s*)no-svg(\s*)/, '$1svg$2' );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ if ( true === supportsFixedBackground() ) {
+ document.documentElement.className += ' background-fixed';
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> });
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> // If navigation menu is present on page, adjust it on scroll and screen resize.
</span></span></pre></div>
<a id="trunksrcwpcontentthemestwentyseventeenstylecss"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-content/themes/twentyseventeen/style.css</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-content/themes/twentyseventeen/style.css 2016-11-18 19:32:03 UTC (rev 39296)
+++ trunk/src/wp-content/themes/twentyseventeen/style.css 2016-11-18 20:10:18 UTC (rev 39297)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3603,6 +3603,11 @@
</span><span class="cx" style="display: block; padding: 0 10px"> max-height: 1200px;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /* With panel images 100% of the screen height, we're going to fix the background image where supported to create a parallax-like effect. */
+ .background-fixed .panel-image {
+ background-attachment: fixed;
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> .page-two-column .panel-content .entry-header {
</span><span class="cx" style="display: block; padding: 0 10px"> float: left;
</span><span class="cx" style="display: block; padding: 0 10px"> width: 36%;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3993,13 +3998,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-@media screen and ( min-width: 85.45em ) {
-
- .panel-image {
- background-attachment: fixed;
- }
-}
-
</del><span class="cx" style="display: block; padding: 0 10px"> @media screen and ( max-width: 48.875em ) and ( min-width: 48em ) {
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> .admin-bar .site-navigation-fixed.navigation-top,
</span></span></pre>
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