Iframe Initialization Data Attributes

[blittle]

Introduction

Provide secure and synchronous child iframe access to parent data attributes.

The parent opts into sharing data using new childdata-* attributes:

<iframe childdata-theme="dark" childdata-config="..."></iframe>

The child frame accesses this data synchronously via window.parent.dataset:

const theme = window.parent.dataset.theme; // "dark"

Read the complete Explainer.

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