CSS属性all有一个关键字initial，它将CSS属性设置为规范中定义的初始值。all关键字有广泛的浏览器支持，除了IE和Opera Mini家族。

/* basic modern patch */

#reset-this-root {
    all: unset;
}

or

#reset-this-root {
    all: initial;
}

由于IE缺乏支持可能会导致问题，这里有一些方法可以重置一些CSS属性到它们的初始值:

.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;
    /* May need to alter quotes for different locales (e.g fr) */
    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;
    unicode-bidi : normal;
    vertical-align : baseline;
    visibility : visible;
    white-space : normal;
    widows : 0;
    width : auto;
    word-spacing : normal;
    z-index : auto;
    /* basic modern patch */
    all: initial;
    all: unset;
}

相关的GitHub回购与2017年12月更详尽的清单 相关的 MDN相关 相关W3C规范

综上所述，我不认为CSS重置是可行的，除非我们最终只有一个web浏览器，如果'默认'是由浏览器设置的。

对于那些试图弄清楚如何真正从元素中删除样式，而不从文件中删除css的人，这个解决方案使用jquery:

$('.selector').removeAttr('style');

我正在为我的项目使用Material-Tailwind，并且正在努力删除一个元素的默认css。所以我简单地添加了style={{all: "revert"}}作为我的jsx的属性，它为我工作。

As other answers have mentioned, the CSS property all set to the value unset seems to override all CSS properties without knowing which properties are in play. However, this did not work for me while adding custom CSS in a Wordpress site, as the all property was not recognized by the Wordpress custom CSS editor, and did not reflect changes in Microsoft Edge. Instead, what worked for me was a brute-force override, that is, to identify every property used in the webpage element and manually reset each one of them. The way to identify the CSS properties being used by an element is to inspect the element with your web browser, and go through the 'Styles' tab.

你有没有可能在找!重要规则?它不会撤销所有声明，但它提供了一种重写它们的方法。

当在样式声明上使用!important规则时，该声明将覆盖CSS中所做的任何其他声明，无论它位于声明列表中的哪个位置。虽然，important与专一性无关。

https://developer.mozilla.org/en-US/docs/CSS/Specificity The_ !important_exception

在我的特定场景中，我想跳过对页面的特定部分应用通用样式，更好地说明如下:

<body class='common-styles'>
    <div id='header'>Wants common styles</div>
    <div id='container'>Does NOT want common styles</div>
    <div id='footer'>Wants common styles</div>
</body>

在打乱CSS重置并没有带来多大成功(主要是因为规则优先级和复杂的样式表层次结构)之后，出现了无处不在的jQuery来拯救它，它很快就完成了这项工作，而且相当脏:

$(function() {
    $('body').removeClass('common-styles');
    $('#header,#footer').addClass('common-styles');
});

(现在告诉你用JS来处理CSS是多么的邪恶:-))