From 92d2dbddfcb4124935f57ec4dd097dae54ec2986 Mon Sep 17 00:00:00 2001
From: Nolan Lawson <nolan@nolanlawson.com>
Date: Fri, 16 Nov 2018 00:37:28 -0800
Subject: [PATCH] perf(virtuallist): add contain:content to virtual list items
 (#650)

* perf(virtuallist): add contain:content to virtual list items

* add a few more contain:contents
---
 routes/_components/Nav.html                         | 1 +
 routes/_components/virtualList/VirtualListItem.html | 1 +
 scss/global.scss                                    | 1 +
 templates/2xx.html                                  | 2 +-
 4 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/routes/_components/Nav.html b/routes/_components/Nav.html
index 267b2cc..629f0de 100644
--- a/routes/_components/Nav.html
+++ b/routes/_components/Nav.html
@@ -23,6 +23,7 @@
 		right: 0;
 		top: 0;
 		z-index: 10;
+    contain: content; /* see https://www.w3.org/TR/2018/CR-css-contain-1-20181108/#valdef-contain-content */
 	}
 
   .main-nav-ul {
diff --git a/routes/_components/virtualList/VirtualListItem.html b/routes/_components/virtualList/VirtualListItem.html
index 6d44c19..a419c6c 100644
--- a/routes/_components/virtualList/VirtualListItem.html
+++ b/routes/_components/virtualList/VirtualListItem.html
@@ -16,6 +16,7 @@
     opacity: 0;
     pointer-events: none;
     transition: opacity 0.333s linear;
+    contain: content; /* see https://www.w3.org/TR/2018/CR-css-contain-1-20181108/#valdef-contain-content */
   }
   .virtual-list-item.shown {
     opacity: 1;
diff --git a/scss/global.scss b/scss/global.scss
index 58f34dd..342a25c 100644
--- a/scss/global.scss
+++ b/scss/global.scss
@@ -17,6 +17,7 @@ body {
   left: 0;
   right: 0;
   bottom: 0;
+  contain: content; /* see https://www.w3.org/TR/2018/CR-css-contain-1-20181108/#valdef-contain-content */
   @media (max-width: 991px) {
     top: 52px;
   }
diff --git a/templates/2xx.html b/templates/2xx.html
index e086d7d..9db9221 100644
--- a/templates/2xx.html
+++ b/templates/2xx.html
@@ -17,7 +17,7 @@
   <style>
 /* auto-generated w/ build-sass.js */
 body{--button-primary-bg: #6081e6;--button-primary-text: #fff;--button-primary-border: #132c76;--button-primary-bg-active: #456ce2;--button-primary-bg-hover: #6988e7;--button-bg: #e6e6e6;--button-text: #333;--button-border: #a7a7a7;--button-bg-active: #bfbfbf;--button-bg-hover: #f2f2f2;--input-border: #dadada;--anchor-text: #4169e1;--main-bg: #fff;--body-bg: #e8edfb;--body-text-color: #333;--main-border: #dadada;--svg-fill: #4169e1;--form-bg: #f7f7f7;--form-border: #c1c1c1;--nav-bg: #4169e1;--nav-border: #214cce;--nav-a-border: #4169e1;--nav-a-selected-border: #fff;--nav-a-selected-bg: #6d8ce8;--nav-svg-fill: #fff;--nav-text-color: #fff;--nav-a-selected-border-hover: #fff;--nav-a-selected-bg-hover: #839deb;--nav-a-bg-hover: #577ae4;--nav-a-border-hover: #4169e1;--nav-svg-fill-hover: #fff;--nav-text-color-hover: #fff;--action-button-fill-color: #90a8ee;--action-button-fill-color-hover: #a2b6f0;--action-button-fill-color-active: #577ae4;--action-button-fill-color-pressed: #2351dc;--action-button-fill-color-pressed-hover: #3862e0;--action-button-fill-color-pressed-active: #1d44b8;--action-button-deemphasized-fill-color: #666;--action-button-deemphasized-fill-color-hover: #9e9e9e;--action-button-deemphasized-fill-color-active: #737373;--action-button-deemphasized-fill-color-pressed: #545454;--action-button-deemphasized-fill-color-pressed-hover: #616161;--action-button-deemphasized-fill-color-pressed-active: #404040;--settings-list-item-bg: #fff;--settings-list-item-text: #4169e1;--settings-list-item-text-hover: #4169e1;--settings-list-item-border: #dadada;--settings-list-item-bg-active: #e6e6e6;--settings-list-item-bg-hover: #fafafa;--toast-bg: #333;--toast-border: #fafafa;--toast-text: #fff;--mask-bg: #333;--mask-svg-fill: #fff;--mask-opaque-bg: rgba(51,51,51,0.8);--loading-bg: #ededed;--account-profile-bg-backdrop-filter: rgba(255,255,255,0.7);--account-profile-bg: rgba(255,255,255,0.9);--deemphasized-text-color: #666;--focus-outline: #c5d1f6;--very-deemphasized-link-color: rgba(65,105,225,0.6);--very-deemphasized-text-color: rgba(102,102,102,0.6);--status-direct-background: #d2dcf8;--main-theme-color: #4169e1;--warning-color: #e01f19;--alt-input-bg: rgba(255,255,255,0.7);--muted-modal-bg: transparent;--muted-modal-focus: #999;--muted-modal-hover: rgba(255,255,255,0.2);--compose-autosuggest-item-hover: #ced8f7;--compose-autosuggest-item-active: #b8c7f4;--compose-autosuggest-outline: #dbe3f9;--compose-button-halo: rgba(255,255,255,0.1)}
-body{margin:0;font-family:system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;font-size:14px;line-height:1.4;color:var(--body-text-color);background:var(--body-bg);-webkit-tap-highlight-color:transparent}.container{overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;position:absolute;top:42px;left:0;right:0;bottom:0}@media (max-width: 991px){.container{top:52px}}@media (max-width: 767px){.container{top:62px}}main{position:relative;width:602px;max-width:100vw;padding:0;box-sizing:border-box;margin:30px auto 15px;background:var(--main-bg);border:1px solid var(--main-border);border-radius:1px;min-height:70vh}@media (max-width: 767px){main{margin:5px auto 15px}}footer{width:602px;max-width:100vw;box-sizing:border-box;margin:15px auto;border-radius:1px;background:var(--main-bg);font-size:0.9em;padding:20px;border:1px solid var(--main-border)}h1,h2,h3,h4,h5,h6{margin:0 0 0.5em 0;font-weight:400;line-height:1.2}h1{font-size:2em}a{color:var(--anchor-text);text-decoration:none}a:visited{color:var(--anchor-text)}a:hover{text-decoration:underline}input{border:1px solid var(--input-border);padding:5px;box-sizing:border-box}input[type=search]{-webkit-appearance:none}input,textarea{background:inherit;color:inherit}button,.button{font-size:1.2em;background:var(--button-bg);border-radius:2px;padding:10px 15px;border:1px solid var(--button-border);cursor:pointer;color:var(--button-text)}button:hover,.button:hover{background:var(--button-bg-hover);text-decoration:none}button:active,.button:active{background:var(--button-bg-active)}button[disabled],.button[disabled]{opacity:0.35;pointer-events:none;cursor:not-allowed}button.primary,.button.primary{border:1px solid var(--button-primary-border);background:var(--button-primary-bg);color:var(--button-primary-text)}button.primary:hover,.button.primary:hover{background:var(--button-primary-bg-hover)}button.primary:active,.button.primary:active{background:var(--button-primary-bg-active)}p,label,input{font-size:1.3em}ul,li,p{padding:0;margin:0}.hidden{opacity:0}*:focus{outline:2px solid var(--focus-outline)}.container:focus{outline:none}button::-moz-focus-inner{border:0}input:required,input:invalid{box-shadow:none}textarea{font-family:inherit;font-size:inherit;box-sizing:border-box}@keyframes spin{0%{transform:rotate(0deg)}25%{transform:rotate(90deg)}50%{transform:rotate(180deg)}75%{transform:rotate(270deg)}100%{transform:rotate(360deg)}}.spin{animation:spin 1.5s infinite linear}.ellipsis::after{content:"\2026"}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0, 0, 0, 0);border:0}.inline-custom-emoji{width:1.4em;height:1.4em;margin:-0.1em 0;object-fit:contain;vertical-align:middle}
+body{margin:0;font-family:system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;font-size:14px;line-height:1.4;color:var(--body-text-color);background:var(--body-bg);-webkit-tap-highlight-color:transparent}.container{overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;position:absolute;top:42px;left:0;right:0;bottom:0;contain:content}@media (max-width: 991px){.container{top:52px}}@media (max-width: 767px){.container{top:62px}}main{position:relative;width:602px;max-width:100vw;padding:0;box-sizing:border-box;margin:30px auto 15px;background:var(--main-bg);border:1px solid var(--main-border);border-radius:1px;min-height:70vh}@media (max-width: 767px){main{margin:5px auto 15px}}footer{width:602px;max-width:100vw;box-sizing:border-box;margin:15px auto;border-radius:1px;background:var(--main-bg);font-size:0.9em;padding:20px;border:1px solid var(--main-border)}h1,h2,h3,h4,h5,h6{margin:0 0 0.5em 0;font-weight:400;line-height:1.2}h1{font-size:2em}a{color:var(--anchor-text);text-decoration:none}a:visited{color:var(--anchor-text)}a:hover{text-decoration:underline}input{border:1px solid var(--input-border);padding:5px;box-sizing:border-box}input[type=search]{-webkit-appearance:none}input,textarea{background:inherit;color:inherit}button,.button{font-size:1.2em;background:var(--button-bg);border-radius:2px;padding:10px 15px;border:1px solid var(--button-border);cursor:pointer;color:var(--button-text)}button:hover,.button:hover{background:var(--button-bg-hover);text-decoration:none}button:active,.button:active{background:var(--button-bg-active)}button[disabled],.button[disabled]{opacity:0.35;pointer-events:none;cursor:not-allowed}button.primary,.button.primary{border:1px solid var(--button-primary-border);background:var(--button-primary-bg);color:var(--button-primary-text)}button.primary:hover,.button.primary:hover{background:var(--button-primary-bg-hover)}button.primary:active,.button.primary:active{background:var(--button-primary-bg-active)}p,label,input{font-size:1.3em}ul,li,p{padding:0;margin:0}.hidden{opacity:0}*:focus{outline:2px solid var(--focus-outline)}.container:focus{outline:none}button::-moz-focus-inner{border:0}input:required,input:invalid{box-shadow:none}textarea{font-family:inherit;font-size:inherit;box-sizing:border-box}@keyframes spin{0%{transform:rotate(0deg)}25%{transform:rotate(90deg)}50%{transform:rotate(180deg)}75%{transform:rotate(270deg)}100%{transform:rotate(360deg)}}.spin{animation:spin 1.5s infinite linear}.ellipsis::after{content:"\2026"}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0, 0, 0, 0);border:0}.inline-custom-emoji{width:1.4em;height:1.4em;margin:-0.1em 0;object-fit:contain;vertical-align:middle}
 body.the-body.offline{--button-primary-bg: #ababab;--button-primary-text: #fff;--button-primary-border: #4d4d4d;--button-primary-bg-active: #9c9c9c;--button-primary-bg-hover: #b0b0b0;--button-bg: #e6e6e6;--button-text: #333;--button-border: #a7a7a7;--button-bg-active: #bfbfbf;--button-bg-hover: #f2f2f2;--input-border: #dadada;--anchor-text: #999;--main-bg: #fff;--body-bg: #fafafa;--body-text-color: #333;--main-border: #dadada;--svg-fill: #999;--form-bg: #f7f7f7;--form-border: #c1c1c1;--nav-bg: #999;--nav-border: gray;--nav-a-border: #999;--nav-a-selected-border: #fff;--nav-a-selected-bg: #b3b3b3;--nav-svg-fill: #fff;--nav-text-color: #fff;--nav-a-selected-border-hover: #fff;--nav-a-selected-bg-hover: #bfbfbf;--nav-a-bg-hover: #a6a6a6;--nav-a-border-hover: #999;--nav-svg-fill-hover: #fff;--nav-text-color-hover: #fff;--action-button-fill-color: #c7c7c7;--action-button-fill-color-hover: #d1d1d1;--action-button-fill-color-active: #a6a6a6;--action-button-fill-color-pressed: #878787;--action-button-fill-color-pressed-hover: #949494;--action-button-fill-color-pressed-active: #737373;--action-button-deemphasized-fill-color: #666;--action-button-deemphasized-fill-color-hover: #9e9e9e;--action-button-deemphasized-fill-color-active: #737373;--action-button-deemphasized-fill-color-pressed: #545454;--action-button-deemphasized-fill-color-pressed-hover: #616161;--action-button-deemphasized-fill-color-pressed-active: #404040;--settings-list-item-bg: #fff;--settings-list-item-text: #999;--settings-list-item-text-hover: #999;--settings-list-item-border: #dadada;--settings-list-item-bg-active: #e6e6e6;--settings-list-item-bg-hover: #fafafa;--toast-bg: #333;--toast-border: #fafafa;--toast-text: #fff;--mask-bg: #333;--mask-svg-fill: #fff;--mask-opaque-bg: rgba(51,51,51,0.8);--loading-bg: #ededed;--account-profile-bg-backdrop-filter: rgba(255,255,255,0.7);--account-profile-bg: rgba(255,255,255,0.9);--deemphasized-text-color: #666;--focus-outline: #bfbfbf;--very-deemphasized-link-color: rgba(153,153,153,0.6);--very-deemphasized-text-color: rgba(102,102,102,0.6);--status-direct-background: #ededed;--main-theme-color: #999;--warning-color: #e01f19;--alt-input-bg: rgba(255,255,255,0.7);--muted-modal-bg: transparent;--muted-modal-focus: #999;--muted-modal-hover: rgba(255,255,255,0.2);--compose-autosuggest-item-hover: #c4c4c4;--compose-autosuggest-item-active: #b8b8b8;--compose-autosuggest-outline: #ccc;--compose-button-halo: rgba(255,255,255,0.1)}
 
 </style>