Validators typically use a This example uses the HTML5 doctype.
There are several good reasons to validate against HTML5 rather than the older HTML4 or XHTML standards, even if your HTML document does not use any of the new features introduced in HTML5.
If you are not careful, you risk building your web pages on assumptions of browser behavior, that were never intentional, never documented and likely to not hold in the future.
It can be used to group elements for styling purposes (using the class or id attributes), or because they share attribute values, such as lang.
It should be used only when no other semantic element is appropriate.
An often used validator is the World Wide Web Consortium's HTML Validator.
It's provided by the same people who are responsible for the HTML specification, and more importantly most of its error messages provide a link to an explanation of what the error means.
For example, if you add a missing end-table tag () represents data in two dimensions or more.") to a document, you might fix every "element not allowed here" error that followed.
In any case, the goal of every author should be to have no errors at all of either kind.
In computer modeling and simulation, the process of determining the degree to which a model or simulation is an accurate representation of the real world from the perspective of the intended uses of the model or simulation.3.
Execution procedure used by combatant command components, supporting combatant commanders, and providing organizations to confirm to the supported commander and US Transportation Command that all the information records in a time-phased force and deployment data not only are error free for automation purposes, but also accurately reflect the current status, attributes, and availability of units and requirements.
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Before you create a failover cluster, we strongly recommend that you validate your configuration, that is, that you run all tests in the Validate a Configuration Wizard.