📅 最后修改于: 2021-01-08 00:36:28 🧑 作者: Mango
与“ Developer Preview”版本匹配时，聚合物铁元素称为核心元素，用于创建应用程序。
表：
| Index | Field | Description |
|---|---|---|
| 1) | iron-a11y-keys | These elements are used to process keyboard commands by using cross-browser interface. |
| 2) | iron-ajax | The iron-ajax elements are useful in making the ajax calls. |
| 3) | iron-collapse | The iron-collapse elements are used to collapse a content. To show or hide the content use opened or toggle(). |
| 4) | iron-image | These elements are used for displaying a single image. |
| 5) | iron-dropdown | These are low-level elements used to reveal the hidden dropdown content. |
| 6) | iron-flex-layout | These elements are useful to provide CSS flexible box layout. |
| 7) | iron-form | The iron-form element is an HTML element used to validate and submit any custom elements. |
| 8) | iron-icon | These elements are used to display a single icon. |
| 9) | iron-swipeable-container | It is a container that allows swapping of its nested children, i.e. native or custom elements. |
表：
| Index | Elements | Description |
|---|---|---|
| 1) | iron-a11y-announcer | An element that helps with announcing text through screen readers. |
| 2) | iron-a11y-keys | A basic element implementation of iron-a11y-keys-behavior. |
| 3) | iron-a11y-keys-behavior | A behavior that enables key bindings for greater a11y |
| 4) | iron-ajax | Easily make Ajax requests |
| 5) | iron-autogrow-textarea | Textarea that grows in height as more lines of input are entered |
| 6) | iron-behaviors | Behaviors that manage control states like ‘focused’, ‘disabled’, and ‘active’ |
| 7) | iron-collapse | Adds collapsible behavior to a target element |
| 8) | iron-component-page | A reusable landing page for elements |
| 9) | iron-demo-helpers | Utility classes to make building demo pages easier |
| 10) | iron-doc-viewer | Polymer documentation viewer elements |
| 11) | iron-dropdown | An unstyled element that works similarly to a native browser select |
| 12) | iron-fit-behavior | Fits an element into another element |
| 13) | iron-flex-layout | Style mixins for cross-platform flex-box layouts |
| 14) | iron-icon | Element that displays a single icon |
| 15) | iron-icons | A set of icons for use with iron-icon |
| 16) | iron-iconset | Represents a source of icons expressed as a raster sprite sheet |
| 17) | iron-iconset-svg | Represents a source of icons expressed as a collection of inline SVGs |
| 18) | iron-image | Image element with sizing and preloading options |
| 19) | iron-jsonp-library | Loads jsonp libraries. |
| 20) | iron-list | Element for a virtual, “infinite” list |
| 21) | iron-location | A Polymer element that manages binding to the page’s URL. |
| 22) | iron-media-query | Data binding for a CSS Media Query |
| 23) | iron-overlay-behavior | Makes an element an overlay with an optional backdrop |
| 24) | iron-pages | Simple content switcher |
| 25) | iron-swipeable-container | A container that allows any of its nested children to be swiped away. |
| 26) | iron-test-helpers | Utility classes to make testing easier |