CSS CSS Pseudo-element NeedsBrowserCompatibility NeedsCompatTable NeedsExample NeedsMobileBrowserCompatibility Non-standard Pseudo-element Reference Référence

The ::placeholder CSS pseudo-element represents the placeholder text of a form element. This allows web developers and theme designers to customize the appearance of placeholder text.

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The ::spelling-error CSS pseudo-element represents a text segment which the browser has flagged as incorrectly spelled.

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The non-standard proprietary ::-webkit-input-placeholder pseudo-element represents the placeholder text of a form element. This allows web developers and theme designers to customize the appearance of placeholder text. This pseudo-class is only supported by WebKit and Blink.

CSS CSS Pseudo-element CSS Reference NeedsBrowserCompatibility NeedsExample NeedsMobileBrowserCompatibility Non-standard Pseudo-element Reference

CSS CSS Pseudo-element NeedsBrowserCompatibility NeedsCompatTable NeedsExample NeedsMobileBrowserCompatibility Non-standard Pseudo-element Reference

The ::-webkit-slider-thumb CSS pseudo-element represents the "thumb" that the user can move within the "groove" of an <input> of type="range" to alter its numerical value.

CSS CSS Pseudo-element NeedsBrowserCompatibility NeedsCompatTable NeedsExample NeedsMobileBrowserCompatibility Non-standard Pseudo-element Reference

The :any-link CSS pseudo-class represents an element that acts as the source anchor of a hyperlink independent of whether it has been visited, that is, it matches every <a>, <area> or <link> elements with an href attribute. So, it matches all elements that match :link or :visited.

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The :-moz-window-inactive CSS pseudo-class matches any element while it's in an inactive window.

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CSS CSS Masks CSS Property Layout NeedsBrowserCompatibility NeedsMobileBrowserCompatibility Reference SVG Web

-ms-overflow-style is a proprietary CSS property, specific to Internet Explorer and Microsoft Edge, which controls the behavior of scrollbars when an element's content overflows.

CSS CSS Property CSS Reference NeedsBrowserCompatibility NeedsCompatTable NeedsExample NeedsMobileBrowserCompatibility Non-standard Property Reference

Writes an error message to the console if the assertion is false. If the assertion is true, nothing happens.

API console Console debugging Debugging DOM Method NeedsBrowserCompatibility web console Web Development

Displays an interactive list of the properties of the specified JavaScript object. The output is presented as a hierarchical listing with disclosure triangles that let you see the contents of child objects.

API console console.dir Debugging debugging dir DOM JSON Method NeedsBrowserCompatibility web console Web Development

Creates a new inline group in the Web Console. Unlike console.group(), however, the new group is created collapsed. The user will need to use the disclosure button next to it to expand it, revealing the entries created in the group.

API debugging Debugging DOM DOM Reference Method NeedsBrowserCompatibility Reference web console Web Development

document.designMode controls whether the entire document is editable. Valid values are "on" and "off". According to the specification, this property is meant to default to "off". Firefox follows this standard. The earlier versions of Chrome and IE default to "inherit". Starting in Chrome 43, the default is "off" and "inherit" is no longer supported. In IE6-10, the value is capitalized. 

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The URL read-only property of the Document interface returns the document location as a string.

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Used by the dataset HTML attribute to represent data for custom attributes added to elements.

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The HTMLElement.offsetWidth read-only property returns the layout width of an element. Typically, an element's offsetWidth is a measurement which includes the element borders, the element horizontal padding, the element vertical scrollbar (if present, if rendered) and the element CSS width.

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The HTMLElement.style property returns a CSSStyleDeclaration object that represents only the element's inline style attribute, ignoring any applied style rules.  See the CSS Properties Reference for a list of the CSS properties accessible via style.

API HTML DOM HTMLElement NeedsBrowserAgnosticism NeedsBrowserCompatibility NeedsMarkupWork NeedsSpecTable Property Reference Référence

API Constructor HTML DOM HTMLImageElement NeedsBrowserCompatibility NeedsContent NeedsMarkupWork NeedsSpecTable Reference Référence