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All style guides are fundamentally opinionated. Some decisions genuinely do make code easier to use (especially matching indenting to programming structure), but many decisions are arbitrary. The most important thing about a style guide is that it provides consistency, making code easier to write because you need to make fewer decisions.
In the same manner as elements, elements can include media attributes that contain media queries, allowing you to selectively apply internal stylesheets to your document depending on media features such as viewport width.
This attribute explicitly indicates that certain operations should be blocked on the fetching of critical subresources. @import-ed stylesheets are generally considered as critical subresources, whereas background-image and fonts are not.
A cryptographic nonce (number used once) used to allow inline styles in a style-src Content-Security-Policy. The server must generate a unique nonce value each time it transmits a policy. It is critical to provide a nonce that cannot be guessed as bypassing a resource's policy is otherwise trivial.
Define overloaded operators only if their meaning isobvious, unsurprising, and consistent with the correspondingbuilt-in operators. For example, use as abitwise- or logical-or, not as a shell-style pipe.
Existing code bases have an enormous number of function declarations that aren't going to get changed to use the new syntax, so the realistic choices are using the old syntax only or using a mixture of the two. Using a single version is better for uniformity of style.
In most cases, continue to use the older style of function declaration where the return type goes before the function name. Use the new trailing-return-type form only in cases where it's required (such as lambdas) or where, by putting the type after the function's parameter list, it allows you to write the type in a much more readable way. The latter case should be rare; it's mostly an issue in fairly complicated template code, which is discouraged in most cases.
If the type is a template instance, and the parameters are boilerplate but the template itself is informative, you can use class template argument deduction to suppress the boilerplate. However, cases where this actually provides a meaningful benefit are quite rare. Note that class template argument deduction is also subject to a separate style rule.
The most important consistency rules are those that governnaming. The style of a name immediately informs us what sort ofthing the named entity is: a type, a variable, a function, aconstant, a macro, etc., without requiring us to search for thedeclaration of that entity. The pattern-matching engine in ourbrains relies a great deal on these naming rules.
Template parameters should follow the naming style for theircategory: type template parameters should follow the rules fortype names, and non-type templateparameters should follow the rules for variable names.
Until January 2009, the style was to name enum valueslike macros. This causedproblems with name collisions between enum values andmacros. Hence, the change to prefer constant-style namingwas put in place. New code should use constant-stylenaming.
Comments should be as readable as narrative text, withproper capitalization and punctuation. In many cases,complete sentences are more readable than sentencefragments. Shorter comments, such as comments at the endof a line of code, can sometimes be less formal, but youshould be consistent with your style.
Coding style and formatting are pretty arbitrary, but aproject is much easier to followif everyone uses the same style. Individuals may not agree with everyaspect of the formatting rules, and some of the rules may takesome getting used to, but it is important that allproject contributors follow thestyle rules so thatthey can all read and understandeveryone's code easily.
Use this style only when the statement is brief, and consider that loops andbranching statements with complex conditions or controlled statements may bemore readable with curly braces. Someprojects require curly braces always.
When referring to a pointer or reference (variable declarations or definitions, arguments,return types, template parameters, etc), you may place the space before or after theasterisk/ampersand. In the trailing-space style, the space is elided in some cases (templateparameters, etc).
Style sheets solve these problems at the same time they supersede thelimited range of presentation mechanisms in HTML. Style sheets make it easy tospecify the amount of white space between text lines, the amount lines areindented, the colors used for the text and the backgrounds, the font size andstyle, and a host of other details.
Style sheets, by contrast, apply to specific media or media groups. A stylesheet intended for screen use may be applicable when printing, but is of littleuse for speech-based browsers. This specification allows you to define thebroad categories of media a given style sheet is applicable to. This allowsuser agents to avoid retrieving inappropriate style sheets. Style sheetlanguages may include features for describing media dependencies within thesame style sheet.
In many cases, authors will take advantage of a common style sheet for agroup of documents. In this case, distributing style rules throughout thedocument will actually lead to worse performance than using a linked stylesheet, since for most documents, the style sheet will already be present in thelocal cache. The public availability of good style sheets will encourage thiseffect.
Note. The sample default style sheet for HTML 4 that isincluded in [CSS2] expresses generally accepted default style informationfor each element. Authors and implementors alike might find this a usefulresource.
Any style sheet language may be used with HTML. A simple style sheetlanguage may suffice for the needs of most users, but other languages may bemore suited to highly specialized needs. This specification uses the stylelanguage "Cascading Style Sheets" ([CSS1]), abbreviated CSS,for examples.
Authors should use the META element to set the default stylesheet language for a document. For example, to set the default to CSS, authorsshould put the following declaration in the HEAD of their documents:
Documents that include elements that set the styleattribute but which don't define a default style sheet language are incorrect.Authoring tools shouldgenerate default style sheet language information (typically a META declaration) so that user agents do not have to rely on adefault of "text/css".
The syntax of the value of the style attribute is determined by the default style sheet language. For example, for [[CSS2]]inline style, use the declaration block syntax described in section 4.1.8(without curly brace delimiters).
User agents that don't support style sheets, or don't support the specificstyle sheet language used by a STYLE element, must hide the contents of the STYLE element. It is an error to renderthe content as part of the document's text. Some style sheet languages supportsyntax for hiding the content from non-conforming useragents.
Although style information may be set foralmost every HTML element, two elements, DIV and SPAN, are particularly useful in that they donot impose any presentation semantics (besides block-level vs. inline). When combinedwith style sheets, these elements allow users to extend HTML indefinitely,particularly when used with the class and id attributes.
In the following example, we use DIV and the class attribute to set the text justification for a series ofparagraphs that make up the abstract section of a scientific article. Thisstyle information could be reused for other abstract sections by setting the class attribute elsewhere in the document.
HTML allows authors to design documents that take advantage of thecharacteristics of the media where the document is to be rendered (e.g.,graphical displays, television screens, handheld devices, speech-basedbrowsers, braille-based tactile devices, etc.). By specifying the mediaattribute, authors allow user agents to load and apply style sheetsselectively. Please consult the list of recognized media descriptors.
Media control is particularly interesting when applied to external stylesheets since user agents can save time by retrieving from the network onlythose style sheets that apply to the current device. For instance, speech-basedbrowsers can avoid downloading style sheets designed for visual rendering. Seethe section on media-dependent cascades for moreinformation.
HTML allows authors to associate any number of external style sheets with adocument. The style sheet language defines how multiple external style sheetsinteract (for example, the CSS "cascade" rules).
Authors may specify a number of mutuallyexclusive style sheets called alternate style sheets.Users may select their favorite among these depending on their preferences. Forinstance, an author may specify one style sheet designed for small screens andanother for users with weak vision (e.g., large fonts). User agents shouldallow users to select from alternate style sheets.
Authors may group several alternate style sheets (including the author'spreferred style sheets) under a single style name. When a userselects a named style, the user agent must apply all style sheets with thatname. User agents must not apply alternate style sheets with a different stylename. The section on specifying external stylesheets explains how to name a group of style sheets.
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