CSS3关键字
initial将CSS3属性设置为spec中定义的初始值。该
initial关键字具有广泛的浏览器支持，但IE和Opera Mini系列除外。
由于IE缺乏支持，可能会引起问题，因此您可以通过以下几种方法将某些CSS属性重置为其初始值：
.reset-this { animation : none; animation-delay : 0; animation-direction : normal; animation-duration : 0; animation-fill-mode : none; animation-iteration-count : 1; animation-name : none; animation-play-state : running; animation-timing-function : ease; backface-visibility : visible; background : 0; background-attachment : scroll; background-clip : border-box; background-color : transparent; background-image : none; background-origin : padding-box; background-position : 0 0; background-position-x : 0; background-position-y : 0; background-repeat : repeat; background-size : auto auto; border : 0; border-style : none; border-width : medium; border-color : inherit; border-bottom : 0; border-bottom-color : inherit; border-bottom-left-radius : 0; border-bottom-right-radius : 0; border-bottom-style : none; border-bottom-width : medium; border-collapse : separate; border-image : none; border-left : 0; border-left-color : inherit; border-left-style : none; border-left-width : medium; border-radius : 0; border-right : 0; border-right-color : inherit; border-right-style : none; border-right-width : medium; border-spacing : 0; border-top : 0; border-top-color : inherit; border-top-left-radius : 0; border-top-right-radius : 0; border-top-style : none; border-top-width : medium; bottom : auto; box-shadow : none; box-sizing : content-box; caption-side : top; clear : none; clip : auto; color : inherit; columns : auto; column-count : auto; column-fill : balance; column-gap : normal; column-rule : medium none currentColor; column-rule-color : currentColor; column-rule-style : none; column-rule-width : none; column-span : 1; column-width : auto; content : normal; counter-increment : none; counter-reset : none; cursor : auto; direction : ltr; display : inline; empty-cells : show; float : none; font : normal; font-family : inherit; font-size : medium; font-style : normal; font-variant : normal; font-weight : normal; height : auto; hyphens : none; left : auto; letter-spacing : normal; line-height : normal; list-style : none; list-style-image : none; list-style-position : outside; list-style-type : disc; margin : 0; margin-bottom : 0; margin-left : 0; margin-right : 0; margin-top : 0; max-height : none; max-width : none; min-height : 0; min-width : 0; opacity : 1; orphans : 0; outline : 0; outline-color : invert; outline-style : none; outline-width : medium; overflow : visible; overflow-x : visible; overflow-y : visible; padding : 0; padding-bottom : 0; padding-left : 0; padding-right : 0; padding-top : 0; page-break-after : auto; page-break-before : auto; page-break-inside : auto; perspective : none; perspective-origin : 50% 50%; position : static; quotes : '201C' '201D' '2018' '2019'; right : auto; tab-size : 8; table-layout : auto; text-align : inherit; text-align-last : auto; text-decoration : none; text-decoration-color : inherit; text-decoration-line : none; text-decoration-style : solid; text-indent : 0; text-shadow : none; text-transform : none; top : auto; transform : none; transform-style : flat; transition : none; transition-delay : 0s; transition-duration : 0s; transition-property : none; transition-timing-function : ease; unipre-bidi : normal; vertical-align : baseline; visibility : visible; white-space : normal; widows : 0; width : auto; word-spacing : normal; z-index : auto; all: initial; all: unset;}#reset-this-root { all: initial; * { all: unset; }}- Relevent github repo以及 2017年12月的 更多详细列表
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如@ user566245的评论中所述：
这在原则上是正确的，但个人里程可能会有所不同。例如，某些元素（例如textarea）默认情况下具有边框，应用此重置将使这些textarea的边框变少。
[17年2月4日编辑后]用户Joost赞扬其成为现代规范
#reset-this-parent { all: initial; * { all: unset; }}W3中的示例
例如，如果作者在元素上指定all：initial，它将阻止所有继承并重置所有属性，就像级联的author，user或user-
agent级别中没有规则一样。这对于不希望继承外部页面样式的页面中包含的“窗口小部件”的根元素很有用。但是请注意，应用于该元素的任何“默认”样式（例如UA样式表上的UA样式表中的display：块，例如）也会被吹走。
JAVAscript？
除了CSS以外，没有人考虑过要重置CSS吗？是？
getElementsByTagName（“ *”）将返回DOM中的所有元素。然后，您可以为集合中的每个元素设置样式：
VisioN在2013年2月9日20:15回答了
var allElements = document.getElementsByTagName("*");for (var i = 0, len = allElements.length; i < len; i++) { var element = allElements[i]; // element.style.border = ...}说了这么多；我不认为CSS重置是可行的，除非我们最终只使用一个Web浏览器..如果最后由浏览器设置了“默认”。
为了进行比较，这是Firefox 40.0值列表，用于触发DOM操作的
<blockquote >where
font-style: oblique。
align-content: unset;align-items: unset;align-self: unset;animation: unset;appearance: unset;backface-visibility: unset;background-blend-mode: unset;background: unset;binding: unset;block-size: unset;border-block-end: unset;border-block-start: unset;border-collapse: unset;border-inline-end: unset;border-inline-start: unset;border-radius: unset;border-spacing: unset;border: unset;bottom: unset;box-align: unset;box-decoration-break: unset;box-direction: unset;box-flex: unset;box-ordinal-group: unset;box-orient: unset;box-pack: unset;box-shadow: unset;box-sizing: unset;caption-side: unset;clear: unset;clip-path: unset;clip-rule: unset;clip: unset;color-adjust: unset;color-interpolation-filters: unset;color-interpolation: unset;color: unset;column-fill: unset;column-gap: unset;column-rule: unset;columns: unset;content: unset;control-character-visibility: unset;counter-increment: unset;counter-reset: unset;cursor: unset;display: unset;dominant-baseline: unset;empty-cells: unset;fill-opacity: unset;fill-rule: unset;fill: unset;filter: unset;flex-flow: unset;flex: unset;float-edge: unset;float: unset;flood-color: unset;flood-opacity: unset;font-family: unset;font-feature-settings: unset;font-kerning: unset;font-language-override: unset;font-size-adjust: unset;font-size: unset;font-stretch: unset;font-style: oblique;font-synthesis: unset;font-variant: unset;font-weight: unset;font: ;force-broken-image-icon: unset;height: unset;hyphens: unset;image-orientation: unset;image-region: unset;image-rendering: unset;ime-mode: unset;inline-size: unset;isolation: unset;justify-content: unset;justify-items: unset;justify-self: unset;left: unset;letter-spacing: unset;lighting-color: unset;line-height: unset;list-style: unset;margin-block-end: unset;margin-block-start: unset;margin-inline-end: unset;margin-inline-start: unset;margin: unset;marker-offset: unset;marker: unset;mask-type: unset;mask: unset;max-block-size: unset;max-height: unset;max-inline-size: unset;max-width: unset;min-block-size: unset;min-height: unset;min-inline-size: unset;min-width: unset;mix-blend-mode: unset;object-fit: unset;object-position: unset;offset-block-end: unset;offset-block-start: unset;offset-inline-end: unset;offset-inline-start: unset;opacity: unset;order: unset;orient: unset;outline-offset: unset;outline-radius: unset;outline: unset;overflow: unset;padding-block-end: unset;padding-block-start: unset;padding-inline-end: unset;padding-inline-start: unset;padding: unset;page-break-after: unset;page-break-before: unset;page-break-inside: unset;paint-order: unset;perspective-origin: unset;perspective: unset;pointer-events: unset;position: unset;quotes: unset;resize: unset;right: unset;ruby-align: unset;ruby-position: unset;scroll-behavior: unset;scroll-snap-coordinate: unset;scroll-snap-destination: unset;scroll-snap-points-x: unset;scroll-snap-points-y: unset;scroll-snap-type: unset;shape-rendering: unset;stack-sizing: unset;stop-color: unset;stop-opacity: unset;stroke-dasharray: unset;stroke-dashoffset: unset;stroke-linecap: unset;stroke-linejoin: unset;stroke-miterlimit: unset;stroke-opacity: unset;stroke-width: unset;stroke: unset;tab-size: unset;table-layout: unset;text-align-last: unset;text-align: unset;text-anchor: unset;text-combine-upright: unset;text-decoration: unset;text-emphasis-position: unset;text-emphasis: unset;text-indent: unset;text-orientation: unset;text-overflow: unset;text-rendering: unset;text-shadow: unset;text-size-adjust: unset;text-transform: unset;top: unset;transform-origin: unset;transform-style: unset;transform: unset;transition: unset;user-focus: unset;user-input: unset;user-modify: unset;user-select: unset;vector-effect: unset;vertical-align: unset;visibility: unset;white-space: unset;width: unset;will-change: unset;window-dragging: unset;word-break: unset;word-spacing: unset;word-wrap: unset;writing-mode: unset;z-index: unset;
