Inspect and trigger CSS media queries | Web | Google Developers
This is where media queries come in. These are the rules to be applied to change the design of a website based on the screen's characteristics!. The Device Mode has a media query inspector built-in that allows for easier responsive Use the Media Query Inspector to inspect and trigger the registered . CSS media queries are the most powerful way to create responsive layouts and they are defined in parentheses and a vast array of features can be tested.
To avoid circular dependencies, it is never necessary to apply the style sheet in order to evaluate expressions. User agents are expected, but not required, to re-evaluate and re-layout the page in response to changes in the user environment, for example if the device is tilted from landscape to portrait mode.
Syntax The media query syntax is described in terms of the CSS2 grammar.
As such, rules not defined here are defined in CSS2. CSS style sheets are generally case-insensitive, and this is also the case for media queries. In addition to conforming to the syntax, each media query needs to use media types and media features according to their respective specification in order to be considered conforming.
Only the first media query is conforming in the example below because the "example" media type does not exist. Error Handling For media queries that are not conforming user agents need to follow the rules described in this section.
Unknown media types evaluate to false. Effectively, they are treated identically to known media types that do not match the media type of the device. The media query "unknown" will evaluate to false, unless unknown is actually a supported media type.
CSS3 Media Queries
Similarly, "not unknown" will evaluate to true. Those fall under the malformed media query clause. User agents are to represent a media query as "not all" when one of the specified media features is not known. Unknown media feature values. As with unknown media features, user agents are to represent a media query as "not all" when one of the specified media feature values is not known.
The media query color: Media queries with unexpected tokens are represented as "not all". That is reserved for the functional notation syntax. Media features Syntactically, media features resemble CSS properties: There are, however, several important differences between properties and media features: Properties are used in declarations to give information about how to present a document. Media features are used in expressions to describe requirements of the output device.
Those media features that accept prefixes will most often be used with prefixes, but can also be used alone. Properties always require a value to form a declaration.
Media features, on the other hand, can also be used without a value. For a media feature feature, feature will evaluate to true if feature: Properties may accept more complex values, e. Media features only accept single values: This specification defines media features usable with visual and tactile devices. Similarly, media features can be defined for aural media types. For continuous media, this is the width of the viewport as described by CSS2, section 9.
For paged media, this is the width of the page box as described by CSS2, section For example, this media query expresses that the style sheet is usable on printed output wider than 25cm: For continuous media, this is the height of the viewport including the size of a rendered scroll bar if any.
For paged media, this is the height of the page box. For continuous media, this is the width of the screen.
For paged media, this is the width of the page sheet size. Social signals are become increasingly important as ranking factors for search engines to validate a site's trustworthiness and authority.
HTML compression plays an important role in improving website speed by finding similar strings within a text file and replacing them temporarily to reduce overall file size.
Media Query Responsive Test | viajeras.info
Site Loading Speed Test Check your website's loading speed. Page speed is an important factors in search engine rankings and overall site success.
- CSS Media Queries
- Inspect and trigger CSS media queries
- Media Query Responsive Test
Faster webpages result in higher traffic, better conversions and increased sales over slower loading pages. Page Objects Check if all the objects requested by this webpage can be retrieved. If they are not retrievable, your page may display incorrectly, leading to a bad user experience and lower search engine rankings. A page cache saves dynamically generated pages and serves the pre-generated cached page to reduce server load and site loading time by avoiding the re-loading and execution of PHP scripts.
Flash Test Check if your page uses Flash, an outdated technology that was typically used to deliver rich multimedia content. The web has evolved to replace Flash with open-standard technologies that additionally offered better performance and security. Flash content also does not work well on mobile devices, and is difficult to index by search engines. Image Caching Test Checks if your page is using an image expires tag, which specifies a future expiration date for your images. Users browsers will see this tag and cache the image in their browser until the specified date so that it does not keep re-fetching the unchanged image from your server.
Use of nested tables can slow down page rendering in the user's browser. Frameset Test Check if your page is using frames, which divide your browser window into multiple sections where each section can load separate HTML documents. Frames create problems for both users e. Avoid use of frames when possible. Doctype Test Check for doctype declaration. Proper doctype declaration assists with proper page rendering and functioning of web documents in compliant browsers.
Redirects often cause search engine indexing issues and can also lead to some minor loading delays. Google recommends removing or keeping redirects to a minimum.
Canonicalization describes how a site can use slightly different URLs for the same page e. If this happens, search engines may be unsure about which URL is the correct one to index. Learn more about canonicalization issues. HTTPS should be used by any site that collects sensitive customer data such as credit card information.
Google is increasingly using https as a positive ranking factor. Safe Browsing Test Check if your website is identified as having malware or exhibiting phishing activity by Google's safe browsing API.
Any site containing malware or suspicious for phising activity is seen as a threat to the online community and is often penalized by search engines.
This test checks your website against regularly updated malware and phishing databases of problem websites. A server signature is the public identity of your web server and contains sensitive information that could be used to exploit any known vulnerability. Turning your server signature OFF is considered a good security practice to avoid disclosure of what software versions you are running.
Directory Browsing Test Check if your server allows directory browsing. If directory browsing is disabled, visitors will not be able to browse your directory by accessing the directory directly if there is no index. This will protect your files from being exposed to the public. Apache web server allows directory browsing by default. Disabling directory browsing is generally a good idea from a security standpoint.
Plaintext Emails Test Check your webpage for plaintext email addresses. Any e-mail address posted in public is likely to be automatically collected by computer software used by bulk emailers a process known as e-mail address harvesting.
A spam harvester can read through the pages in your site and extract plaintext email addresses which are then added to bulk marketing databases resulting in more inbox spam. There are several methods for email obfuscation.