:placeholder-shown CSS pseudo-class
Input elements can sometimes show placeholder text as a hint to the user on what to type in. See, for example, the placeholder attribute in HTML5. The :placeholder-shown pseudo-class matches an input element that is showing such placeholder text.
Details & Summary elements
The <details> element generates a simple no-JavaScript widget to show/hide element contents, optionally by clicking on its child <summary> element.
Dialog element
Method of easily creating custom dialog boxes to display to the user with modal or non-modal options. Also includes a `::backdrop` pseudo-element for behind the element.
DNSSEC and DANE
Method of validating a DNS response against a trusted root server. Mitigates various attacks that could reroute a user to a fake site while showing the real URL for the original site.
Media Fragments
Allows only part of a resource to be shown, based on the fragment identifier in the URL. Currently support is primarily limited to video track ranges.
PageTransitionEvent
Fired at the Window when the page's entry in the session history stops being the current entry. Includes the `pageshow` and `pagehide` events.
Small, Large, and Dynamic viewport units
Viewport units similar to `vw` and `vh` that are based on shown or hidden browser UI states to address shortcomings of the original units. Currently defined as the `sv*` units (`svb`, `svh`, `svi`, `svmax`, `svmin`, `svw`), `lv*` units (`lvb`, `lvh`, `lvi`, `lvmax`, `lvmin`, `lvw`), `dv*` units (`dvb`, `dvh`, `dvi`, `dvmax`, `dvmin`, `dvw`) and the logical `vi`/`vb` units.
console api: `dir()` static method: `options.showhidden` parameter
document api: createtreewalker: `whattoshow` and `filter` parameters are optional
htmldialogelement api: show
htmldialogelement api: showmodal
htmlelement api: showpopover
htmlinputelement api: showpicker
htmlinputelement api: showpicker: `autocomplete` input
htmlinputelement api: showpicker: `color` input
htmlinputelement api: showpicker: `datalist` input
htmlinputelement api: showpicker: `datetime-local` input
htmlinputelement api: showpicker: `date` input
htmlinputelement api: showpicker: `file` input
htmlinputelement api: showpicker: `month` input
htmlinputelement api: showpicker: `time` input
htmlinputelement api: showpicker: `week` input
htmlselectelement api: showpicker
nodeiterator api: whattoshow
notification api: `show` event
paymentrequest api: show
serviceworkerregistration api: shownotification
serviceworkerregistration api: shownotification: `options.actions` parameter
serviceworkerregistration api: shownotification: `options.badge` parameter
serviceworkerregistration api: shownotification: `options.data` parameter
serviceworkerregistration api: shownotification: `options.image` parameter
serviceworkerregistration api: shownotification: `options.renotify` parameter
serviceworkerregistration api: shownotification: `options.requireinteraction` parameter
serviceworkerregistration api: shownotification: `options.vibrate` parameter
treewalker api: whattoshow
virtualkeyboard api: show
window api: `pageshow` event
window api: showdirectorypicker
window api: showmodaldialog
window api: showopenfilepicker
window api: showsavefilepicker
css selector: `:placeholder-shown`: support on non-`type="text"` elements (such as `type="number"` or `type="time"`)
svg element: a: `xlink:show`
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