This document defines formatting and style rules for HTML and CSS. It aims at improving collaboration, code quality, and enabling supporting infrastructure. It applies to raw, working files that use HTML and CSS, including GSS files. Tools are free to obfuscate, minify, and compile as long as the general code quality is maintained.
- - - -<!-- TODO: remove optional tags -->
<ul>
<li>Apples</li>
@@ -233,8 +217,6 @@ paragraphs, a elements for anchors, etc.
Using HTML according to its purpose is important for accessibility, reuse, and
code efficiency reasons.
-
-
<!-- Not recommended -->
<div onclick="goToRecommendations();">All recommendations</div>
@@ -259,8 +241,6 @@ may have no way of understanding what video or audio contents are about either.<
whose purpose is purely decorative which you cannot immediately use CSS for, use
no alternative text, as in alt="".)
-
-
<!-- Not recommended -->
<img src="spreadsheet.png">
@@ -288,8 +268,6 @@ sheets and scripts as possible from documents and templates.
maintenance reasons. It is always more expensive to change HTML documents and
templates than it is to update style sheets and scripts.
-
-
<!-- Not recommended -->
<!DOCTYPE html>
<title>HTML sucks</title>
@@ -338,7 +316,7 @@ The currency symbol for the Euro is “€”.
Omit optional tags (optional).
For file size optimization and scannability purposes, consider omitting optional
-tags. The HTML5 specification
+tags. The HTML5 specification
defines what tags can be omitted.
(This approach may require a grace period to be established as a wider guideline
@@ -372,8 +350,8 @@ tags, not just a selection.)
(unless not using JavaScript).
Specifying type attributes in these contexts is not necessary as HTML5 implies
-text/css
-and text/javascript
+text/css
+and text/javascript
as defaults. This can be safely done even for older browsers.
<!-- Not recommended -->
@@ -435,7 +413,37 @@ instead of an error.)
</table>
-3.2.2 HTML Quotation Marks
+3.2.2 HTML Line-Wrapping
+
+Break long lines (optional).
+
+While there is no column limit recommendation for HTML, you may consider
+wrapping long lines if it significantly improves readability.
+
+When line-wrapping, each continuation line should be indented at least 4
+additional spaces from the original line.
+
+<md-progress-circular md-mode="indeterminate" class="md-accent"
+ ng-show="ctrl.loading" md-diameter="35">
+</md-progress-circular>
+
+
+<md-progress-circular
+ md-mode="indeterminate"
+ class="md-accent"
+ ng-show="ctrl.loading"
+ md-diameter="35">
+</md-progress-circular>
+
+
+<md-progress-circular md-mode="indeterminate"
+ class="md-accent"
+ ng-show="ctrl.loading"
+ md-diameter="35">
+</md-progress-circular>
+
+
+3.2.3 HTML Quotation Marks
When quoting attributes values, use double quotation marks.
@@ -586,7 +594,7 @@ padding: 0;
Omit leading “0”s in values.
-Do not use put 0s in front of values or lengths between -1 and 1.
+Do not put 0s in front of values or lengths between -1 and 1.
font-size: .8em;
@@ -614,10 +622,6 @@ color: #ebc;
external sites use prefixes (as namespaces) for ID and class names. Use short,
unique identifiers followed by a dash.
-
-
-
-
Using namespaces helps preventing naming conflicts and can make maintenance
easier, for example in search and replace operations.
@@ -659,10 +663,6 @@ resistance. That is, allowing and making it easy to use detection and hacks
means using detection and hacks more frequently—and more frequently is too
frequently.
-
-
-
-
4.2 CSS Formatting Rules
4.2.1 Declaration Order
@@ -811,11 +811,10 @@ body {
4.2.8 CSS Quotation Marks
-Use single quotation marks for attribute selectors and property values.
-
Use single ('') rather than double ("") quotation marks for attribute
-selectors or property values. Do not use quotation marks in URI values
-(url()).
+selectors and property values.
+
+Do not use quotation marks in URI values (url()).
Exception: If you do need to use the @charset rule, use double quotation
marks—single quotation marks are not permitted.
@@ -858,26 +857,6 @@ sections with new lines.
.adw-gallery {}
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Parting Words
Be consistent.