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The latter results * in the browser repairing the HTML, which will likely result in an error during hydration. * @param {string} current * @param {string} [next] */ export function closing_tag_omitted(current, next) { const disallowed = autoclosing_children[current]; if (disallowed) { if ( !next || ('direct' in disallowed ? disallowed.direct : disallowed.descendant).includes(next) ) { return true; } } return false; } /** * Map of elements that have certain elements that are not allowed inside them, in the sense that the browser will somehow repair the HTML. * There are more elements that are invalid inside other elements, but they're not repaired and so don't break SSR and are therefore not listed here. * @type {Record<string, { direct: string[]} | { descendant: string[]; reset_by?: string[]; only?: string[] } | { only: string[] }>} */ const disallowed_children = { ...autoclosing_children, optgroup: { only: ['option', '#text'] }, // Strictly speaking, seeing an <option> doesn't mean we're in a <select>, but we assume it here option: { only: ['#text'] }, form: { descendant: ['form'] }, a: { descendant: ['a'] }, button: { descendant: ['button'] }, h1: { descendant: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'] }, h2: { descendant: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'] }, h3: { descendant: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'] }, h4: { descendant: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'] }, h5: { descendant: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'] }, h6: { descendant: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'] }, // https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inselect select: { only: ['option', 'optgroup', '#text', 'hr', 'script', 'template'] }, // https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-intd // https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-incaption // No special behavior since these rules fall back to "in body" mode for // all except special table nodes which cause bad parsing behavior anyway. // https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-intd tr: { only: ['th', 'td', 'style', 'script', 'template'] }, // https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-intbody tbody: { only: ['tr', 'style', 'script', 'template'] }, thead: { only: ['tr', 'style', 'script', 'template'] }, tfoot: { only: ['tr', 'style', 'script', 'template'] }, // https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-incolgroup colgroup: { only: ['col', 'template'] }, // https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-intable table: { only: ['caption', 'colgroup', 'tbody', 'thead', 'tfoot', 'style', 'script', 'template'] }, // https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inhead head: { only: [ 'base', 'basefont', 'bgsound', 'link', 'meta', 'title', 'noscript', 'noframes', 'style', 'script', 'template' ] }, // https://html.spec.whatwg.org/multipage/semantics.html#the-html-element html: { only: ['head', 'body', 'frameset'] }, frameset: { only: ['frame'] }, '#document': { only: ['html'] } }; /** * Returns false if the tag is not allowed inside the ancestor tag (which is grandparent and above) such that it will result * in the browser repairing the HTML, which will likely result in an error during hydration. * @param {string} tag * @param {string[]} ancestors All nodes starting with the parent, up until the ancestor, which means two entries minimum * @returns {boolean} */ export function is_tag_valid_with_ancestor(tag, ancestors) { if (tag.includes('-')) return true; // custom elements can be anything const target = ancestors[ancestors.length - 1]; const disallowed = disallowed_children[target]; if (!disallowed) return true; if ('reset_by' in disallowed && disallowed.reset_by) { for (let i = ancestors.length - 2; i >= 0; i--) { const ancestor = ancestors[i]; if (ancestor.includes('-')) return true; // custom elements can be anything // A reset means that forbidden descendants are allowed again if (disallowed.reset_by.includes(ancestors[i])) { return true; } } } return 'descendant' in disallowed ? !disallowed.descendant.includes(tag) : true; } /** * Returns false if the tag is not allowed inside the parent tag such that it will result * in the browser repairing the HTML, which will likely result in an error during hydration. * @param {string} tag * @param {string | null} parent_tag * @returns {boolean} */ export function is_tag_valid_with_parent(tag, parent_tag) { if (tag.includes('-') || parent_tag?.includes('-')) return true; // custom elements can be anything if (parent_tag !== null) { const disallowed = disallowed_children[parent_tag]; if (disallowed) { if ('direct' in disallowed && disallowed.direct.includes(tag)) { return false; } if ('descendant' in disallowed && disallowed.descendant.includes(tag)) { return false; } if ('only' in disallowed && disallowed.only) { return disallowed.only.includes(tag); } } } switch (tag) { case 'body': case 'caption': case 'col': case 'colgroup': case 'frameset': case 'frame': case 'head': case 'html': case 'tbody': case 'td': case 'tfoot': case 'th': case 'thead': case 'tr': // These tags are only valid with a few parents that have special child // parsing rules - if we're down here, then none of those matched and // so we allow it only if we don't know what the parent is, as all other // cases are invalid (and we only get into this function if we know the parent). return false; } return true; } |